Vulnerability in Discourse

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 TopicA…

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

  • Discourse — versions >= 2026.5.0-latest, < 2026.5.1, >= 2026.4.0-latest, < 2026.4.2, >= 2026.1.0-latest, < 2026.1.5

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-53961?
CVE-2026-53961 is a medium-severity vulnerability in Discourse, classified under Insufficient Verification of Data Authenticity. CVSS score: 6.5/10. Published 2026-07-09.
How severe is CVE-2026-53961?
Medium severity. CVSS v3 base score is 6.5 out of 10.