Vulnerability · Published Feb 26, 2026 · Assigned by GitHub_M

CVE-2026-27153Discourse doesn't prevent moderators from exporting user Chat DMs

Low 1.3

In plain English

A low-severity incorrect authorization in discourse 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 4.0)1.3Low

Exploit odds (30 days)0.2%top 92.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, moderators could export user Chat DMs via the CSV export endpoint by exploiting an overly permissive allowlist in `can_export_entity?`. The method allowed moderators to export any entity not explicitly blocked instead of restricting to an explicit allowlist. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

Affected products (as reported)

Vendor	Product	Versions
discourse	discourse	< 2025.12.2>= 2026.1.0-latest, < 2026.1.1>= 2026.2.0-latest, < 2026.2.0

Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U

References

https://github.com/discourse/discourse/security/advisories/GHSA-5cp2-jq8m-33mf x_refsource_CONFIRM