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‎advisories/github-reviewed/2026/05/GHSA-64hg-93w9-fc35/GHSA-64hg-93w9-fc35.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-64hg-93w9-fc35",
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"modified": "2026-05-28T17:22:36Z",
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"published": "2026-05-28T17:22:36Z",
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"aliases": [
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"CVE-2026-45754"
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],
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"summary": "Symfony's Mailjet Mailer Webhook Parser Never Verifies the Configured Secret — Unauthenticated Webhook Event Injection",
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"details": "### Description\n\nThe Mailjet mailer bridge and the LOX24 SMS notifier bridge both ship webhook request parsers used to authenticate and decode the event callbacks each provider POSTs to an application's webhook endpoint. Their `doParse(Request $request, #[\\SensitiveParameter] string $secret)` methods receive the configured webhook secret but never read it; they convert and return the payload unconditionally.\n\nAs a result, an application that wires up either webhook endpoint accepts **any** POST to that URL, even when a webhook secret is configured (the recommended setup). An attacker who knows the endpoint exists can submit forged event payloads, fake bounce / blocked / spam / open / click / delivery events, leading to suppression-list corruption, delivery-metrics fraud, etc.\n\n### Resolution\n\n`MailjetRequestParser::doParse()` now rejects the request unless it carries the expected HTTP Basic credentials, Mailjet's webhook authentication mechanism, using a constant-time comparison. The configured webhook secret is matched against the credentials embedded in the Mailjet webhook URL as `user:password` (use `:password` when the URL has no username).\n\n`Lox24RequestParser::doParse()` now rejects the request unless it carries an `X-LOX24-Token` HTTP header whose value matches the configured secret, using a constant-time comparison. The same token must be configured in the LOX24 dashboard under the callback settings.\n\nWhen no secret is configured the behaviour is unchanged: webhook authentication remains opt-in, but it is now actually enforced once opted in.\n\nThe Mailjet patch is available [here](https://github.com/symfony/symfony/commit/3e52bf5ab733ee32e35eeeeb2631d859c941838e) for branch 6.4.\n\nThe LOX24 patch is available [here](https://github.com/symfony/symfony/commit/4aaa45dd054f73445f1ab254968b7e60b546cc77) for branch 7.4 (the LOX24 bridge was introduced in 7.1 and is not present in 6.4).\n\n### Credits\n\nSymfony would like to thank Himanshu Anand for reporting the issue, and Alexandre Daubois and Nicolas Grekas for providing the fixes.",
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"severity": [
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{
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"type": "CVSS_V4",
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"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U"
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}
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],
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"affected": [
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{
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"package": {
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"ecosystem": "Packagist",
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"name": "symfony/lox24-notifier"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "7.1.0"
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},
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{
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"fixed": "7.4.12"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Packagist",
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"name": "symfony/lox24-notifier"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "8.0.0"
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},
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{
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"fixed": "8.0.12"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Packagist",
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"name": "symfony/symfony"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "6.4.0"
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},
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{
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"fixed": "6.4.40"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Packagist",
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"name": "symfony/symfony"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "7.0.0"
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},
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{
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"fixed": "7.4.12"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Packagist",
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"name": "symfony/symfony"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "8.0.0"
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},
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{
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"fixed": "8.0.12"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Packagist",
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"name": "symfony/mailjet-mailer"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "6.4.0"
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},
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{
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"fixed": "6.4.40"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Packagist",
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"name": "symfony/mailjet-mailer"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "7.0.0"
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},
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{
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"fixed": "7.4.12"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Packagist",
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"name": "symfony/mailjet-mailer"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "8.0.0"
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},
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{
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"fixed": "8.0.12"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"type": "WEB",
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"url": "https://github.com/symfony/symfony/security/advisories/GHSA-64hg-93w9-fc35"
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},
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{
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"type": "WEB",
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"url": "https://github.com/symfony/symfony/commit/4aaa45dd054f73445f1ab254968b7e60b546cc77"
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},
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{
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"type": "WEB",
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"url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/lox24-notifier/CVE-2026-45754.yaml"
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},
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{
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"type": "WEB",
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"url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mailjet-mailer/CVE-2026-45754.yaml"
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},
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{
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"type": "WEB",
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"url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45754.yaml"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/symfony/symfony"
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},
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{
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"type": "WEB",
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"url": "https://symfony.com/cve-2026-45754"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-287",
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"CWE-306"
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],
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"severity": "MODERATE",
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"github_reviewed": true,
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"github_reviewed_at": "2026-05-28T17:22:36Z",
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"nvd_published_at": null
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}
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}

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