CVE-2026-48747
6.3
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Summary
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.13 and 8.0.13, MailomatRequestParser::validateSignature() parsed X-MOM-Webhook-Signature as algo=signature and passed the request-selected algorithm to hash_hmac(), allowing a signature algorithm downgrade instead of enforcing Mailomat's documented SHA-256 webhook signature. This issue is fixed in versions 7.4.13 and 8.0.13.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| symfony | symfony | >= 7.2.0, < 7.4.12 | affected |
| symfony | symfony | >= 8.0.0-BETA1, < 8.0.13 | affected |
| symfony | mailomat-mailer | >= 7.2.0, < 7.4.12 | affected |
| symfony | mailomat-mailer | >= 8.0.0-BETA1, < 8.0.13 | affected |
Weaknesses
- CWE-347: CWE-347: Improper Verification of Cryptographic Signature
- CWE-757: CWE-757: Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
References
- https://github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr
- https://github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88
- https://github.com/symfony/symfony/releases/tag/v7.4.13
- https://github.com/symfony/symfony/releases/tag/v8.0.13
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