Information disclosure in Discourse
CVE-2026-72726
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, an authenticated user could eavesdrop on private AI bot conversations through the AI bot reply stream. The issue is fixed in 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (36.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.001
Affected products
- Discourse — versions < 2026.1.6, >= 2026.5.0, < 2026.5.2, >= 2026.6.0, < 2026.6.1
Weakness classification (CWE)
References
- github.com/discourse/discourse/commit/01faa889830f56e02fba2f6c1731811d319c5e81
- github.com/discourse/discourse/commit/1fb2026eb8004dfeb12553014cc534dfd8083fbc
- github.com/discourse/discourse/commit/9247666f8359f3cf214b8aea3d396e8a8237ed38
- github.com/discourse/discourse/commit/b56b98232aa4dad4a30500a65e31db0c9080c8f5
- github.com/discourse/discourse/security/advisories/GHSA-gw88-2jw8-jf2h
Frequently asked questions
- What is CVE-2026-72726?
- CVE-2026-72726 is a medium-severity vulnerability in Discourse, classified under Information Disclosure. CVSS score: 6.5/10. Published 2026-08-10.
- How severe is CVE-2026-72726?
- Medium severity. CVSS v3 base score is 6.5 out of 10.