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CVE-2026-53961

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:50cbccdc841882e3dfbf0bf7ec868d338ba2dd7fbec8a2590e54c4433c606677
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"discourse","vendor":"discourse","versions":[{"status":"affected","version":">= 2026.5.0-latest, < 2026.5.1"},{"status":"affected","version":">= 2026.4.0-latest, < 2026.4.2"},{"status":"affected","version":">= 2026.1.0-latest, < 2026.1.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/problemTypes/0/descriptions/0

Source references

9 source assertions
{"name":"https://github.com/discourse/discourse/commit/3a3d315a85ef3c6aabfc7e7bb38702059784f06b","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/3a3d315a85ef3c6aabfc7e7bb38702059784f06b"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/references/1
{"name":"https://github.com/discourse/discourse/commit/61f12e13aa1b760f81d5ff60f12e3a7e77434b94","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/61f12e13aa1b760f81d5ff60f12e3a7e77434b94"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/references/2
{"name":"https://github.com/discourse/discourse/commit/958f0cd831d65a49ec75f05343ca2c167679f0ea","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/958f0cd831d65a49ec75f05343ca2c167679f0ea"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/references/3
{"name":"https://github.com/discourse/discourse/commit/aea35190791261bab258ebab05da279e78cdd0e6","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/commit/aea35190791261bab258ebab05da279e78cdd0e6"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/references/4
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.1.5","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.1.5"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/references/5
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.4.2","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.4.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/references/6
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.5.1","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.5.1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/references/7
{"name":"https://github.com/discourse/discourse/releases/tag/v2026.6.0","tags":["x_refsource_MISC"],"url":"https://github.com/discourse/discourse/releases/tag/v2026.6.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/references/8
{"name":"https://github.com/discourse/discourse/security/advisories/GHSA-8f9m-v436-wr3x","tags":["x_refsource_CONFIRM"],"url":"https://github.com/discourse/discourse/security/advisories/GHSA-8f9m-v436-wr3x"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d47fea3b191b80fa71102a870b855ff45e15a8cf3ced83118a04da7e27e0d378 · sha256:2876255e0435376e… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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