CVE-2026-27491
- Source
- https://cve.org/CVERecord?id=CVE-2026-27491
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27491.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-27491
- Aliases
-
- BIT-discourse-2026-27491
- GHSA-xq37-5fvf-4m4j
- Published
- 2026-03-19T20:47:54.668Z
- Modified
- 2026-07-15T01:49:06.267331620Z
- Severity
-
- 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Discourse has a bypass of official warnings messages by non-staff users
- Details
-
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, a type coercion issue in a post actions API endpoint allowed non-staff users to issue warnings to other users. Warnings are a staff-only moderation feature. The vulnerability required the attacker to be a logged-in user and to send a specifically crafted request. No data exposure or privilege escalation beyond the ability to create unauthorized user warnings was possible. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
- Database specific
{ "cwe_ids": [ "CWE-862" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27491.json", "cna_assigner": "GitHub_M" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27491.json
- https://github.com/discourse/discourse/security/advisories/GHSA-xq37-5fvf-4m4j
- https://nvd.nist.gov/vuln/detail/CVE-2026-27491
- https://github.com/discourse/discourse/commit/60a588f4da4ab0feceb2c44787d4261b4f8757be
- https://github.com/discourse/discourse/commit/d3cb203feabc46d765ecb91f348613a2bd531b89
- https://github.com/discourse/discourse/commit/f5fef73827da7520efc517357bd2a6bab35d7886
Affected packages
Git / github.com/discourse/discourse
Affected ranges
- Type
- GIT
- Repo
- https://github.com/discourse/discourse
- Events
-
IntroducedFixedIntroducedFixedIntroducedFixedFixedFixed
- Database specific
{ "cpe": [ "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*", "cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:*" ], "extracted_events": [ { "introduced": "2026.1.0" }, { "fixed": "2026.1.2" }, { "introduced": "2026.2.0" }, { "fixed": "2026.2.1" }, { "introduced": "2026.3.0" }, { "last_affected": "2026.3.0" } ], "source": [ "CPE_RANGE", "CPE_STRING", "REFERENCES" ] }