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Media

Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade

  • Publicada: 15.06.2026
  • Actualizado: 11.10.2026 10:22

Description

Symfony\Component\Mailer\Bridge\Mailomat\Webhook\MailomatRequestParser::validateSignature() parses the X-MOM-Webhook-Signature request header as algo=signature and passes the wire-supplied $algo directly to hash_hmac() when verifying the request against the configured webhook secret. The request therefore selects the HMAC primitive used to authenticate it.

PHP's hash_hmac() enforces only that the chosen algorithm is HMAC-compatible. That set still includes primitives with known cryptanalysis (md4, md5, ripemd128, tiger128,3, … — e.g. existential forgery of HMAC-MD4, Contini & Yin, ASIACRYPT 2006). This is the canonical algorithm-confusion shape, analogous to JWT alg=none / alg=HS256 downgrades: any future cryptographic weakness in any HMAC primitive PHP exposes becomes immediately exploitable against a Mailomat webhook receiver, the moment an attacker is in a position to compute a signature for that primitive, without a code change on the Symfony side.

Mailomat's documented webhook security pins SHA-256; the parser did not.

Resolution

MailomatRequestParser::validateSignature() now requires the signature header to be of the form sha256=<hex> and verifies the signature with HMAC-SHA256 keyed by the configured secret using a constant-time comparison. Any other algorithm declared on the wire (including the HMAC primitives PHP would otherwise accept) is rejected.

The patch for this issue is available here for branch 7.4 (and forward-ported to 8.0 and 8.1).

Credits

Symfony would like to thank Omar Alshammari, Essam Alanazi and Alwaleed Alshammari for reporting the issue and Nicolas Grekas for providing the fix.

Software afectado

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PlataformaPaqueteVersiones vulnerablesCorregida en
Paquete de Composer symfony/mailomat-mailer >= 7.2.0, < 7.4.13, >= 8.0.0, < 8.0.13 7.4.13, 8.0.13
Paquete de Composer symfony/symfony >= 7.2.0, < 7.4.13, >= 8.0.0, < 8.0.13 7.4.13, 8.0.13

Referencias

Puntuación CVSS -
Debilidad (CWE)
CWE-347, CWE-757
Plataforma
Composer
Paquete
symfony/mailomat-mailer, symfony/symfony
Publicada
15.06.2026
Actualizado
11.10.2026 10:22

Fuentes y licencias

OSV / GitHub Advisory Database - GHSA-rrj9-5q2j-4gvr - CC BY 4.0

Historial de vulnerabilidades: symfony/symfony

Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.

Todas (100) en el archivo
Entradas en total
100
Primera → última
11.2019 06.2026
Sin corrección
0
Explotada en ataques
0

Distribución por gravedad

  • Crítica 8
  • Alta 28
  • Media 51
  • Baja 13

Divulgaciones por año

Gravedad:
  1. Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade esta entrada
    Media CVE-2026-48747 >= 7.2.0, < 7.4.13, >= 8.0.0, < 8.0.13 7.4.13, 8.0.13
  2. Symfony: Security Firewall Bypass via failure_forward Subrequest: Unauthenticated Access to access_control-Protected GET Routes
    Alta CVE-2026-48489 < 5.4.53, >= 6.0.0, < 6.4.41, >= 7.0.0, < 7.4.13, >= 8.0.0, < 8.0.13 5.4.53, 6.4.41, 7.4.13, 8.0.13
  3. Symfony has Unauthenticated PHP Object Deserialization in MonologBridge server:log Listener
    Alta CVE-2026-45077 < 5.4.52, >= 6.0.0, < 6.4.40, >= 7.0.0, < 7.4.12, >= 8.0.0, < 8.0.12 5.4.52, 6.4.40, 7.4.12, 8.0.12
  4. Symfony's HEAD Request Bypasses methods: ['GET'] Filter in #[IsGranted] / #[IsSignatureValid] / #[IsCsrfTokenValid]
    Alta CVE-2026-45075 >= 7.4.0, < 7.4.12, >= 8.0.0, < 8.0.12 7.4.12, 8.0.12
  5. Symfony has Email Header / SMTP Command Injection via CRLF in Symfony\Component\Mime\Address
    Alta CVE-2026-45067 < 5.4.52, >= 6.0.0, < 6.4.40, >= 7.0.0, < 7.4.12, >= 8.0.0, < 8.0.12 5.4.52, 6.4.40, 7.4.12, 8.0.12
  6. Symfony Vulnerable to Identity Spoofing via Unanchored DN Regex in X509Authenticator
    Alta CVE-2026-45063 < 5.4.52, >= 6.0.0-BETA1, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12 5.4.52, 6.4.40, 7.4.12, 8.0.12
  7. Symfony's incorrect parsing of PATH_INFO can lead to limited authorization bypass
    Alta · 7.3 CVE-2025-64500 >= 2.0.0, < 5.4.50, >= 6.0.0, < 6.4.29, >= 7.0.0, < 7.3.7 5.4.50, 6.4.29, 7.3.7
  8. Symfony vulnerable to command execution hijack on Windows with Process class
    Alta · 8.4 CVE-2024-51736 < 5.4.46, >= 6.0.0, < 6.4.14, >= 7.0.0, < 7.1.7 5.4.46, 6.4.14, 7.1.7
  9. Symfony Cross-Site Request Forgery vulnerability in the Web Profiler
    Alta · 8.1 CVE-2014-6072 >= 2.0.0, < 2.3.19, >= 2.4.0, < 2.4.9, >= 2.5.0, < 2.5.4 2.3.19, 2.4.9, 2.5.4
  10. Symfony XML Entity Expansion security vulnerability
    Alta · 7.5 ghsa-q2gc-gg3x-7942 >= 2.0.0, < 2.0.17 2.0.17
  11. Symfony XML decoding attack vector through external entities
    Crítica · 9.8 ghsa-mmcv-fvq8-r9x3 >= 2.0.0, < 2.0.11 2.0.11
  12. Symfony allows direct access of ESI URLs behind a trusted proxy
    Alta · 7.5 CVE-2014-5245 >= 2.0.0, < 2.3.19, >= 2.4.0, < 2.4.9, >= 2.5.0, < 2.5.4 2.3.19, 2.4.9, 2.5.4
  13. Symfony vulnerable to denial of service via a malicious HTTP Host header
    Alta · 7.5 CVE-2014-5244 >= 2.0.0, < 2.3.19, >= 2.4.0, < 2.4.9, >= 2.5.0, < 2.5.4 2.3.19, 2.4.9, 2.5.4
  14. Code injection in the way Symfony implements translation caching in FrameworkBundle
    Alta · 7.5 CVE-2014-4931 >= 2.0.0, < 2.3.19, >= 2.4.0, < 2.4.9, >= 2.5.0, < 2.5.4 2.3.19, 2.4.9, 2.5.4
  15. Symfony Incorrect Access Control
    Crítica · 9.8 CVE-2017-11365 >= 2.7.30, < 2.7.32, >= 2.8.23, < 2.8.25, >= 3.2.10, < 3.2.12, >= 3.3.3, < 3.3.5 2.7.32, 2.8.25, 3.2.12, 3.3.5
  16. Symphony Denial of Service Via Overlong Usernames
    Alta · 7.5 CVE-2016-4423 >= 2.3.0, < 2.3.41, >= 2.4.0, < 2.7.13, >= 2.8.0, < 2.8.6, >= 3.0.0, < 3.0.6 2.3.41, 2.7.13, 2.8.6, 3.0.6
  17. Symfony Cryptographic Vulnerability
    Alta · 7.5 CVE-2016-1902 >= 2.3.0, < 2.3.37, >= 2.4.0, < 2.6.13, >= 2.7.0, < 2.7.9 2.3.37, 2.6.13, 2.7.9
  18. Symfony Vulnerable to Timing Attack
    Alta CVE-2015-8125 >= 2.3.0, < 2.3.35, >= 2.7.0, < 2.7.7, >= 2.4.0, < 2.6.12 2.3.35, 2.7.7, 2.6.12
  19. Symphony Vulnerable to PHP Code Injection via YAML Parsing
    Alta CVE-2013-1348 >= 2.0.0, < 2.0.22 2.0.22
  20. Symfony Arbitrary PHP code Execution
    Alta CVE-2013-1397 >= 2.2.0-BETA1, < 2.2.0-BETA2, >= 2.0.0, < 2.0.22, >= 2.1.0, < 2.1.7 2.2.0-BETA2, 2.0.22, 2.1.7
  21. Symfony Authentication Bypass
    Crítica · 9.8 CVE-2018-11407 >= 2.8.0, < 2.8.37, >= 3.0.0, < 3.3.17, >= 3.4.0, < 3.4.7, >= 4.0.0, < 4.0.7 2.8.37, 3.3.17, 3.4.7, 4.0.7
  22. Symfony Authentication Bypass
    Crítica · 9.8 CVE-2016-2403 >= 2.8.0, < 2.8.6, >= 3.0.0, < 3.0.6 2.8.6, 3.0.6
  23. Symfony Host Header Injection
    Alta · 7.2 CVE-2018-14774 >= 2.7.0, < 2.7.49, >= 2.8.0, < 2.8.44, >= 3.3.0, < 3.3.18, >= 3.4.0, < 3.4.14, >= 4.0.0, < 4.0.14, >= 4.1.0, < 4.1.3 2.7.49, 2.8.44, 3.3.18, 3.4.14, 4.0.14, 4.1.3
  24. Symfony Session Fixation Vulnerability
    Alta · 8.1 CVE-2018-11385 >= 2.7.0, < 2.7.48, >= 2.8.0, < 2.8.41, >= 3.0.0, < 3.3.17, >= 3.4.0, < 3.4.11, >= 4.0.0, < 4.0.11 2.7.48, 2.8.41, 3.3.17, 3.4.11, 4.0.11
  25. Symfony Directory Traversal
    Alta · 7.5 CVE-2017-16654 >= 2.7.0, < 2.7.38, >= 2.8.0, < 2.8.31, >= 3.0.0, < 3.2.14, >= 3.3.0, < 3.3.13 2.7.38, 2.8.31, 3.2.14, 3.3.13
  26. Symfony CSRF Token Fixation
    Alta · 8.8 CVE-2018-11406 >= 2.7.0, < 2.7.48, >= 2.8.0, < 2.8.41, >= 3.0.0, < 3.3.17, >= 3.4.0, < 3.4.11, >= 4.0.0, < 4.0.11 2.7.48, 2.8.41, 3.3.17, 3.4.11, 4.0.11
  27. Symfony collectionCascaded and collectionCascadedDeeply fields security bypass
    Alta · 8.1 CVE-2013-4751 >= 2.0.0, < 2.0.24, >= 2.1.0, < 2.1.12, >= 2.2.0, < 2.2.5, >= 2.3.0, < 2.3.3 2.0.24, 2.1.12, 2.2.5, 2.3.3
  28. Symfony Http-Kernel has non-constant time comparison in UriSigner
    Alta · 8.1 CVE-2019-18887 >= 2.2.0, < 2.8.52, >= 3.0.0, < 3.4.35, >= 4.0.0, < 4.2.12, >= 4.3.0, < 4.3.8 2.8.52, 3.4.35, 4.2.12, 4.3.8
  29. RCE in Symfony
    Alta · 8.0 CVE-2020-15094 >= 4.3.0, < 4.4.13, >= 5.0.0, < 5.1.5 4.4.13, 5.1.5
  30. Firewall configured with unanimous strategy was not actually unanimous in Symfony
    Alta · 7.6 CVE-2020-5275 >= 4.4.0, < 4.4.7, >= 5.0.0, < 5.0.7 4.4.7, 5.0.7
  31. Improper authentication in Symfony
    Alta · 7.5 CVE-2019-10911 >= 2.7.0, < 2.7.51, >= 2.8.0, < 2.8.50, >= 3.0.0, < 3.4.26, >= 4.0.0, < 4.1.12, >= 4.2.0, < 4.2.7 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7
  32. Deserialization of untrusted data in Symfony
    Alta · 7.1 CVE-2019-10912 >= 2.8.0, < 2.8.50, >= 3.0.0, < 3.4.26, >= 4.0.0, < 4.1.12, >= 4.2.0, < 4.2.7 2.8.50, 3.4.26, 4.1.12, 4.2.7
  33. Improper Input Validation in Symfony
    Crítica · 9.8 CVE-2019-11325 >= 4.2.0, < 4.2.12, >= 4.3.0, < 4.3.8 4.2.12, 4.3.8
  34. Invalid HTTP method overrides allow possible XSS or other attacks in Symfony
    Crítica · 9.8 CVE-2019-10913 >= 2.7.0, < 2.7.51, >= 2.8.0, < 2.8.50, >= 3.0.0, < 3.4.26, >= 4.0.0, < 4.1.12, >= 4.2.0, < 4.2.7 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7
  35. Argument injection in a MimeTypeGuesser in Symfony
    Alta · 7.5 CVE-2019-18888 >= 2.0.0, < 2.8.52, >= 3.0.0, < 3.4.35, >= 4.0.0, < 4.2.12, >= 4.3.0, < 4.3.8 2.8.52, 3.4.35, 4.2.12, 4.3.8
  36. Symfony Unsafe Cache Serialization Could Enable RCE
    Crítica · 9.8 CVE-2019-18889 >= 3.1.0, < 3.4.35, >= 4.0.0, < 4.2.12, >= 4.3.0, < 4.3.8 3.4.35, 4.2.12, 4.3.8
  37. Symfony Service IDs Allow Injection
    Crítica · 9.8 CVE-2019-10910 >= 2.7.0, < 2.7.51, >= 2.8.0, < 2.8.50, >= 3.0.0, < 3.4.26, >= 4.0.0, < 4.1.12, >= 4.2.0, < 4.2.7 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7

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