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CVE Vulnerability Details :
CVE-2026-27166
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-19 Mar, 2026 | 20:29
Updated At-21 Mar, 2026 | 03:31
Rejected At-
▼CVE Numbering Authority (CNA)
Discourse vulnerable to HTML injection via prohibited iframe URLs

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.

Affected Products
Vendor
Civilized Discourse Construction Kit, Inc.discourse
Product
discourse
Versions
Affected
  • < 2026.3.0-latest.1
  • >= 2026.2.0-latest, < 2026.2.1
  • >= 2026.1.0-latest, < 2026.1.2
Problem Types
TypeCWE IDDescription
CWECWE-80CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Type: CWE
CWE ID: CWE-80
Description: CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Metrics
VersionBase scoreBase severityVector
3.14.1MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
Version: 3.1
Base score: 4.1
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/discourse/discourse/security/advisories/GHSA-h653-cq78-vjj2
x_refsource_CONFIRM
https://github.com/discourse/discourse/commit/c4762a4fac2f61f52f325396b11d3aeb955ea925
x_refsource_MISC
Hyperlink: https://github.com/discourse/discourse/security/advisories/GHSA-h653-cq78-vjj2
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/discourse/discourse/commit/c4762a4fac2f61f52f325396b11d3aeb955ea925
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found