MEDIUM

CVE-2026-59830

2026-09-21 CVSS v3.1

CVSS

5.4

Description

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.

Weakness (CWE)

CWE-79 Cross-site Scripting (XSS)

References

https://github.com/discourse/discourse/commit/dd786594ddd088657a7e6f9fefba5bd889965fe4 https://github.com/discourse/discourse/releases/tag/v2026.7.0 https://github.com/discourse/discourse/security/advisories/GHSA-x6mf-p7cg-69rw

View on dbcve.org

Base CVE data derived from NVD (public domain). Enrichment by dbcve.org (CC-BY-4.0). Fetched via API.

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