Medium severity5.3OSV Advisory· Published Jul 14, 2026· Updated Jul 15, 2026
CVE-2026-48747
CVE-2026-48747
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
symfony/mailomat-mailerPackagist | >= 7.2.0, < 7.4.13 | 7.4.13 |
symfony/mailomat-mailerPackagist | >= 8.0.0, < 8.0.13 | 8.0.13 |
symfony/symfonyPackagist | >= 7.2.0, < 7.4.13 | 7.4.13 |
symfony/symfonyPackagist | >= 8.0.0, < 8.0.13 | 8.0.13 |
Affected products
3v8.0.12, v7.4.12, v8.0.11, …+ 2 more
- (no CPE)range: v8.0.12, v7.4.12, v8.0.11, …
- (no CPE)range: <7.4.13, <8.0.13
- cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*range: >=7.2.0,<7.4.13
Patches
Vulnerability mechanics
References
8- github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88nvdPatchWEB
- github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvrnvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-rrj9-5q2j-4gvrghsaADVISORY
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mailomat-mailer/CVE-2026-48747.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48747.yamlghsaWEB
- github.com/symfony/symfony/releases/tag/v7.4.13nvdProductRelease Notes
- github.com/symfony/symfony/releases/tag/v8.0.13nvdProductRelease Notes
- symfony.com/cve-2026-48747ghsaWEB
News mentions
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