{"id":"CVE-2026-48747","summary":"Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade","details":"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.","aliases":["GHSA-rrj9-5q2j-4gvr"],"modified":"2026-08-12T03:51:44.323291011Z","published":"2026-07-14T19:16:24.327Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-347","CWE-757"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48747.json"},"references":[{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v7.4.13"},{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v8.0.13"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48747.json"},{"type":"ADVISORY","url":"https://github.com/symfony/symfony/security/advisories/GHSA-rrj9-5q2j-4gvr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48747"},{"type":"FIX","url":"https://github.com/symfony/symfony/commit/bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/symfony/security-http","events":[{"introduced":"0d0ab4d491f22306c893b2d30ce73ea911201a61"},{"fixed":"da3c28025a664e6a88e1af104a74457d99301161"},{"introduced":"bea6dc79db4d95c34b77ec27273d812aa64d65be"},{"fixed":"ca895c1303cc1d290f190cd7301d48fcef9e73e5"}],"database_specific":{"cpe":"cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"7.2.0"},{"fixed":"7.4.13"},{"introduced":"8.0.0"},{"fixed":"8.0.13"}],"source":"CPE_RANGE"}},{"type":"GIT","repo":"https://github.com/symfony/symfony","events":[{"introduced":"df8cd437bf489cf5aebe7e01e61daad120321c3b"},{"fixed":"d9981b6e4c77b97472845a9b7fcba5507208aacc"},{"introduced":"2e913a829cfbbf9cb38b321bdff1806b44b192eb"},{"fixed":"ad82cb517407582bb697e079c5ee62bf8b7af3b7"},{"fixed":"bdfe9fe0d94d33dfaca0bc2fe0b00b54767b0c88"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"7.2.0"},{"fixed":"7.4.13"},{"introduced":"8.0.0"},{"fixed":"8.0.13"}]}}],"versions":["v8.0.12","v7.4.12","v8.0.11","v7.4.11","v7.4.0-BETA1","v8.0.9","v7.4.9","v8.0.8","v7.4.8","v8.0.6","v7.4.6","v8.0.4","v7.4.4","v8.0.3","v7.4.3","v8.0.1","v7.4.1","v7.4.0","v8.0.0","v7.4.0-RC2","v7.4.0-RC1","v7.3.0","v7.3.0-RC1","v7.3.0-BETA2","v7.3.0-BETA1","v7.2.1","v7.2.0-RC1","v7.2.0","v8.0.10","v8.0.7","v8.0.5","v8.0.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48747.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}