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CVE-2026-53961 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/discourse/discourse/commit/3a3d315a85ef3c6aabfc7e7bb38702059784f06b	[email protected]	Patch
https://github.com/discourse/discourse/commit/61f12e13aa1b760f81d5ff60f12e3a7e77434b94	[email protected]	Patch
https://github.com/discourse/discourse/commit/958f0cd831d65a49ec75f05343ca2c167679f0ea	[email protected]	Patch
https://github.com/discourse/discourse/commit/aea35190791261bab258ebab05da279e78cdd0e6	[email protected]	Patch
https://github.com/discourse/discourse/releases/tag/v2026.1.5	[email protected]	Release Notes
https://github.com/discourse/discourse/releases/tag/v2026.4.2	[email protected]	Release Notes
https://github.com/discourse/discourse/releases/tag/v2026.5.1	[email protected]	Release Notes
https://github.com/discourse/discourse/releases/tag/v2026.6.0	[email protected]	Release Notes
https://github.com/discourse/discourse/security/advisories/GHSA-8f9m-v436-wr3x	[email protected]	Vendor Advisory

see all 9 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-345	Insufficient Verification of Data Authenticity	[email protected]

Affected Products

Product	Versions
discourse discourse	>= 2026.1.0, < 2026.1.5 >= 2026.4.0, < 2026.4.2 >= 2026.5.0, < 2026.5.1 2026.6.0
CPE cpe:2.3:a:discourse:discourse:::::::: cpe:2.3:a:discourse:discourse:2026.6.0::::latest::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Jul 14, 2026	Initial Analysis	[email protected]
Jul 10, 2026	CVE Modified	CISA-ADP
Jul 9, 2026	New CVE Received	[email protected]