CVE-2026-48747

6.3 mediumEPSS 0.2%

Medium (6.3) in sensiolabs symfony. EPSS 0.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

6.3 medium

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

CVSS 3.1

5.3 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 16% of CVEs (scores of 2026-10-31)
CWEs: CWE-347, CWE-757
Published: 2026-07-14
Modified: 2026-07-15
Record from: the NVD, synced 2026-10-19

Affected

sensiolabs:symfony

References

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
https://github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr

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