{"id":"CVE-2026-53961","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-53961","generatedAt":"2026-10-28T03:39:15.761Z","title":"Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, the AWS SES bounce webhook at POST /webhooks/aws verified that SNS messages were signed by Amazon but did not bind them to trusted TopicArn values, allowing any AWS account holder to publish validly…","description":"Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, the AWS SES bounce webhook at POST /webhooks/aws verified that SNS messages were signed by Amazon but did not bind them to trusted TopicArn values, allowing any AWS account holder to publish validly signed forged Bounce notifications that revoke a targeted user email. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.","published":"2026-07-09T22:17:05.000Z","lastModified":"2026-07-14T20:37:07.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"},"cwe":["CWE-345"],"affected":["discourse/discourse"],"epss":{"score":0.003,"percentile":0.22545,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.30%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/discourse/discourse/commit/3a3d315a85ef3c6aabfc7e7bb38702059784f06b","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/commit/61f12e13aa1b760f81d5ff60f12e3a7e77434b94","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/commit/958f0cd831d65a49ec75f05343ca2c167679f0ea","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/commit/aea35190791261bab258ebab05da279e78cdd0e6","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.1.5","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.4.2","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.5.1","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/releases/tag/v2026.6.0","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/discourse/discourse/security/advisories/GHSA-8f9m-v436-wr3x","tags":["Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53961","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}