CVE-2026-59830
mediumDiscourse is an open-source discussion platform.
Discourse is an open-source discussion platform. Prior to 2026.7.0, the post action component failed to escape user-controlled display names before interpolating them into an HTML string passed to trustHTML. A user who could choose a crafted display name could persist markup in post action descriptions. Viewing the affected user activity streams could execute attacker-controlled script in another user's browser. This issue is fixed in version 2026.7.0.
CVSS
5.4
5.4 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Severity source: NVD CVSS v3.1 (security-advisories@github.com)
Timeline (UTC)
Published: 2026-09-21 22:16
Modified: 2026-09-23 17:17
NVD status: Deferred
Last synced 3 days ago
Verified against the source API 2026-10-27 06:54 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/discourse/discourse/commit/dd786594ddd088657a7e6f9fefba5bd889965fe4 security-advisories@github.com
- https://github.com/discourse/discourse/releases/tag/v2026.7.0 security-advisories@github.com
- https://github.com/discourse/discourse/security/advisories/GHSA-x6mf-p7cg-69rw security-advisories@github.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:54 UTC · record ↗