Medium severity6.5NVD Advisory· Published Jul 9, 2026· Updated Jul 14, 2026
CVE-2026-53961
CVE-2026-53961
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.
Affected products
4cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*range: >=2026.1.0,<2026.1.5
- cpe:2.3:a:discourse:discourse:2026.6.0:*:*:*:latest:*:*:*
- (no CPE)range: <2026.6.0, <2026.5.1, <2026.4.2, <2026.1.5
Patches
Vulnerability mechanics
References
9- github.com/discourse/discourse/commit/3a3d315a85ef3c6aabfc7e7bb38702059784f06bnvdPatch
- github.com/discourse/discourse/commit/61f12e13aa1b760f81d5ff60f12e3a7e77434b94nvdPatch
- github.com/discourse/discourse/commit/958f0cd831d65a49ec75f05343ca2c167679f0eanvdPatch
- github.com/discourse/discourse/commit/aea35190791261bab258ebab05da279e78cdd0e6nvdPatch
- github.com/discourse/discourse/security/advisories/GHSA-8f9m-v436-wr3xnvdVendor Advisory
- github.com/discourse/discourse/releases/tag/v2026.1.5nvdRelease Notes
- github.com/discourse/discourse/releases/tag/v2026.4.2nvdRelease Notes
- github.com/discourse/discourse/releases/tag/v2026.5.1nvdRelease Notes
- github.com/discourse/discourse/releases/tag/v2026.6.0nvdRelease Notes
News mentions
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