XSS in Discourse
CVE-2026-72725
Discourse is an open-source discussion platform. Prior to 2026.1.6, the staff action log model rendered unescaped previous and new value fields that could inject stored cross-site scripting into the staff interface. The issue is fixed in 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · 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/66601a6e6eeeabfcb06d2f692d68534be12de082
- github.com/discourse/discourse/commit/74ae22d85f4e13c7c7f2e3c13fce023feec7e033
- github.com/discourse/discourse/commit/fd44510b4303e7f8f0b42bd070a2d42d3cda259f
- github.com/discourse/discourse/security/advisories/GHSA-8x29-vv56-wj6v
Frequently asked questions
- What is CVE-2026-72725?
- CVE-2026-72725 is a medium-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-08-10.
- How severe is CVE-2026-72725?
- Medium severity. CVSS v3 base score is 5.4 out of 10.