Ghostwire

CVE-2026-48747: Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade

MEDIUM CVSS 0.0 Exploit Available

Published: June 15, 2026 | Last Modified: June 15, 2026

Description

Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade

Ghostwire Analysis — What This Means Practically

Exploit code is reported to be available, increasing the likelihood of active exploitation.

This analysis is generated by Ghostwire from NVD, CISA KEV, EPSS, and open-source intelligence data. Verify findings through primary sources before acting.

References

github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr
github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88
github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mailomat-mailer/
github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026
symfony.com/cve-2026-48747
github.com/advisories/GHSA-rrj9-5q2j-4gvr
www.tenable.com/cve/CVE-2026-48747
www.cnnvd.org.cn/home/globalSearch?keyword=CVE-2026-48747