{"id":"CVE-2026-45755","state":"PUBLISHED","title":"Symfony: Mailtrap Mailer Webhook Parser Never Verifies the X-Mt-Signature HMAC — Unauthenticated Webhook Event Injection","description":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.12 and 8.0.12, MailtrapRequestParser::doParse() received the configured webhook secret but ignored the X-Mt-Signature HMAC header, allowing unauthenticated POST requests to inject forged Mailtrap delivery, bounce, open, click, or spam events. This issue is fixed in versions 7.4.12 and 8.0.12.","publishedAt":"2026-07-14T18:56:20.615Z","updatedAt":"2026-07-14T19:46:25.210Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["symfony symfony","/mailtrap-mailer mailtrap-mailer"],"affected":[{"vendor":"symfony","product":"symfony","versions":[{"version":">= 7.2.0, < 7.4.12","status":"affected"},{"version":">= 8.0.0-BETA1, < 8.0.12","status":"affected"}]},{"vendor":"/mailtrap-mailer","product":"mailtrap-mailer","versions":[{"version":">= 7.2.0, < 7.4.12","status":"affected"},{"version":">= 8.0.0-BETA1, < 8.0.12","status":"affected"}]}],"references":["https://github.com/symfony/symfony/security/advisories/GHSA-59f3-vp2f-mp9w","https://github.com/symfony/symfony/commit/4e0467e4e182cf2e704a3d9e1bc1a6be65d52ab8","https://github.com/symfony/symfony/releases/tag/v7.4.12","https://github.com/symfony/symfony/releases/tag/v8.0.12"],"weaknesses":["CWE-306","CWE-347"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/45xxx/CVE-2026-45755.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-45755","state":"PUBLISHED","datePublished":"2026-07-14T18:56:20.615Z","dateUpdated":"2026-07-14T19:46:25.210Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-13T06:54:34.221Z"},"containers":{"cna":{"title":"Symfony: Mailtrap Mailer Webhook Parser Never Verifies the X-Mt-Signature HMAC — Unauthenticated Webhook Event Injection","descriptions":[{"lang":"en","value":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.12 and 8.0.12, MailtrapRequestParser::doParse() received the configured webhook secret but ignored the X-Mt-Signature HMAC header, allowing unauthenticated POST requests to inject forged Mailtrap delivery, bounce, open, click, or spam events. This issue is fixed in versions 7.4.12 and 8.0.12."}],"affected":[{"vendor":"symfony","product":"symfony","versions":[{"version":">= 7.2.0, < 7.4.12","status":"affected"},{"version":">= 8.0.0-BETA1, < 8.0.12","status":"affected"}]},{"vendor":"/mailtrap-mailer","product":"mailtrap-mailer","versions":[{"version":">= 7.2.0, < 7.4.12","status":"affected"},{"version":">= 8.0.0-BETA1, < 8.0.12","status":"affected"}]}],"references":[{"url":"https://github.com/symfony/symfony/security/advisories/GHSA-59f3-vp2f-mp9w","name":"https://github.com/symfony/symfony/security/advisories/GHSA-59f3-vp2f-mp9w","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/symfony/symfony/commit/4e0467e4e182cf2e704a3d9e1bc1a6be65d52ab8","name":"https://github.com/symfony/symfony/commit/4e0467e4e182cf2e704a3d9e1bc1a6be65d52ab8","tags":["x_refsource_MISC"]},{"url":"https://github.com/symfony/symfony/releases/tag/v7.4.12","name":"https://github.com/symfony/symfony/releases/tag/v7.4.12","tags":["x_refsource_MISC"]},{"url":"https://github.com/symfony/symfony/releases/tag/v8.0.12","name":"https://github.com/symfony/symfony/releases/tag/v8.0.12","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":6.9,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306: Missing Authentication for Critical Function","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-14T18:56:20.615Z"},"source":{"advisory":"GHSA-59f3-vp2f-mp9w","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-14T19:37:52.693893Z","id":"CVE-2026-45755","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-14T19:46:25.210Z"}}]}}}