Vulnerability · Published Oct 16, 2026 · Assigned by GitHub_M

CVE-2026-57447Discourse Doc Categories: Doc category index refresh leaks private topic titles

Medium 4.3

In plain English

A medium-severity information exposure in discourse-doc-categories from discourse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.2%top 92.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Discourse Doc Categories is a plugin for organizing Discourse topics as documentation. Prior to the verified source fix, the doc category index refresh resolves linked titles for private messages or restricted category topics without enforcing the viewer's authorization. A user who can edit the index topic can use this behavior to learn titles that the user is not authorized to view, although the advisory does not establish access to topic contents. This vulnerability is addressed by commit b15d4de02ad29d7c9525346afee51fef4a2c605a.

Affected products (as reported)

Vendor	Product	Versions
discourse	discourse-doc-categories	< b15d4de02ad29d7c9525346afee51fef4a2c605a

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/discourse/discourse-doc-categories/security/advisories/GHSA-x63p-48vw-8r64 x_refsource_CONFIRM
https://github.com/discourse/discourse-doc-categories/commit/b15d4de02ad29d7c9525346afee51fef4a2c605a x_refsource_MISC