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CVE-2026-53961

6.5 · MEDIUM

Discourse is an open-source discussion platform.

Published Jul 9, 2026CWE-345EPSS 0.30%

Overview

CVE-2026-53961 is a medium-severity vulnerability. It was published on July 9, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/discourse/discourse/commit/3a3d315a85ef3c6aabfc7e7bb38702059784f06bGitHubgithub.com/discourse/discourse/commit/61f12e13aa1b760f81d5ff60f12e3a7e77434b94GitHubgithub.com/discourse/discourse/commit/958f0cd831d65a49ec75f05343ca2c167679f0eaGitHubgithub.com/discourse/discourse/commit/aea35190791261bab258ebab05da279e78cdd0e6GitHubgithub.com/discourse/discourse/releases/tag/v2026.1.5GitHubgithub.com/discourse/discourse/releases/tag/v2026.4.2GitHubgithub.com/discourse/discourse/releases/tag/v2026.5.1GitHubgithub.com/discourse/discourse/releases/tag/v2026.6.0GitHubgithub.com/discourse/discourse/security/advisories/GHSA-8f9m-v436-wr3x

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53961?

CVE-2026-53961 is a medium-severity vulnerability. It was published on July 9, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-53961?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-53961?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53961?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53961 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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