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CVE-2026-53961Discourse: Forged AWS SNS bounce notifications can disable a targeted user's email (missing TopicArn binding)
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.
6.5 MEDIUMEPSS 0.30%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.5 | MEDIUM | 3.1GitHub_M (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
Details
- CVE ID
- CVE-2026-53961
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Jul 9, 2026
- Last modified
- 2026-07-14 20:37 UTC
- Weaknesses
- CWE-345 · Insufficient Verification of Data Authenticity
Affected Products
As published by the CNA in the CVE record.
discoursediscourse3 version ranges
- >= 2026.5.0-latest, < 2026.5.1
- >= 2026.4.0-latest, < 2026.4.2
- >= 2026.1.0-latest, < 2026.1.5
References
- github.com https://github.com/discourse/discourse/commit/3a3d315a85ef3c6aabfc7e7bb38702059784f06b
- github.com https://github.com/discourse/discourse/commit/61f12e13aa1b760f81d5ff60f12e3a7e77434b94
- github.com https://github.com/discourse/discourse/commit/958f0cd831d65a49ec75f05343ca2c167679f0ea
- github.com https://github.com/discourse/discourse/commit/aea35190791261bab258ebab05da279e78cdd0e6
- github.com https://github.com/discourse/discourse/releases/tag/v2026.1.5
- github.com https://github.com/discourse/discourse/releases/tag/v2026.4.2
- github.com https://github.com/discourse/discourse/releases/tag/v2026.5.1
- github.com https://github.com/discourse/discourse/releases/tag/v2026.6.0
- github.com https://github.com/discourse/discourse/security/advisories/GHSA-8f9m-v436-wr3x