Vulnerability in Sensiolabs Symfony
CVE-2026-48747
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (14.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Sensiolabs Symfony
- Symfony Mailomat-Mailer — versions >= 7.2.0, < 7.4.12, >= 8.0.0-BETA1, < 8.0.13
- Symfony — versions >= 7.2.0, < 7.4.12, >= 8.0.0-BETA1, < 8.0.13
Weakness classification (CWE)
References
- github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr (Patch, Vendor Advisory)
- github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88 (Patch)
- github.com/symfony/symfony/releases/tag/v7.4.13 (Product, Release Notes)
- github.com/symfony/symfony/releases/tag/v8.0.13 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-48747?
- CVE-2026-48747 is a medium-severity vulnerability in Sensiolabs Symfony, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.3/10. Published 2026-07-14.
- How severe is CVE-2026-48747?
- Medium severity. CVSS v3 base score is 5.3 out of 10.