CVE-2026-48747

Summary: CVE-2026-48747 affects Symfony’s Mailomat webhook parser. The MailomatRequestParser::validateSignature() method reads the X-MOM-Webhook-Signature header and passes the wire-provided algorithm directly to hash_hmac(), enabling a signature algorithm downgrade instead of enforcing SHA-256 a...

PT-2026-44170

Name of the Vulnerable Software and Affected Versions mailomat-mailer affected versions not specified Description A Signature Algorithm Downgrade flaw exists in the mailomat-mailer component. This issue allows an attacker to perform complete Signature Forgery, which is the act of creating a...

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

More info at https://symfony.com/cve-2026-48747...

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

More info at https://symfony.com/cve-2026-48747...