Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sensiolabs | Symfony | >= 7.2.0, < 7.4.13 |
Related Weaknesses (CWE)
References
- https://github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0cPatch
- https://github.com/symfony/symfony/releases/tag/v7.4.13ProductRelease Notes
- https://github.com/symfony/symfony/releases/tag/v8.0.13ProductRelease Notes
- https://github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvrPatchVendor Advisory
FAQ
What is CVE-2026-48747?
CVE-2026-48747 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 ...
How severe is CVE-2026-48747?
CVE-2026-48747 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48747?
Check the references section above for vendor advisories and patch information. Affected products include: Sensiolabs Symfony.