CVE-2026-27740
- Source
- https://cve.org/CVERecord?id=CVE-2026-27740
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27740.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-27740
- Aliases
-
- BIT-discourse-2026-27740
- GHSA-95hc-42c6-wvvr
- Published
- 2026-03-19T20:56:17.272Z
- Modified
- 2026-07-15T01:48:57.405081010Z
- Severity
-
- 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N CVSS Calculator
- Summary
- Discourse has Stored XSS in AI Triage Automation
- Details
-
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a cross-site scripting vulnerability that arises because the system trusts the raw output from an AI Large Language Model (LLM) and renders it using htmlSafe in the Review Queue interface without adequate sanitization. A malicious attacker can use valid Prompt Injection techniques to force the AI to return a malicious payload (e.g., tags). When a Staff member (Admin/Moderator) views the flagged post in the Review Queue, the payload executes. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, temporarily disable AI triage automation scripts.
- Database specific
{ "cwe_ids": [ "CWE-79" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27740.json", "cna_assigner": "GitHub_M" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27740.json
- https://github.com/discourse/discourse/security/advisories/GHSA-95hc-42c6-wvvr
- https://nvd.nist.gov/vuln/detail/CVE-2026-27740
- https://github.com/discourse/discourse/commit/44b84439df7e4424b2e7f216fd8fdd7dacff2227
- https://github.com/discourse/discourse/commit/8ae7cb2414d6918d7fc45e1fda7ffbb32912a975
- https://github.com/discourse/discourse/commit/ed70949f2c047196f33cfa94f2819df29c5d1e5f
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" ] }