CVE-2026-27166
- Source
- https://cve.org/CVERecord?id=CVE-2026-27166
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27166.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-27166
- Aliases
-
- BIT-discourse-2026-27166
- GHSA-h653-cq78-vjj2
- Published
- 2026-03-19T20:29:22.570Z
- Modified
- 2026-07-15T01:49:13.040697801Z
- Severity
-
- 4.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N CVSS Calculator
- Summary
- Discourse vulnerable to HTML injection via prohibited iframe URLs
- Details
-
Discourse is an open source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1 and 2026.1.2, insufficient cleanup in the default Codepen allowed iframes value allows an attacker to trick a user into changing the URL of the main page. This issue has been fixed in versions 2026.3.0-latest.1, 2026.2.1 and 2026.1.2. To workaround this issue, remove Codepen from the list of allowed iframes.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-80" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27166.json" }- References
Affected packages
Git / github.com/discourse/discourse
Affected ranges
- Type
- GIT
- Repo
- https://github.com/discourse/discourse
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedIntroducedFixedIntroducedFixedIntroducedFixed
- Database specific
{ "source": [ "CPE_RANGE", "CPE_STRING", "REFERENCES" ], "cpe": [ "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*", "cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:*" ], "extracted_events": [ { "introduced": "0" }, { "fixed": "2026.3.0" }, { "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" } ] }