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NVD Vulnerability Details :
CVE-2026-27166
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-19 Mar, 2026 | 21:17
Updated At-25 Mar, 2026 | 01:06

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.14.1MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
Primary3.15.4MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Type: Secondary
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
Type: Primary
Version: 3.1
Base score: 5.4
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CPE Matches
Civilized Discourse Construction Kit, Inc.
discourse
>>discourse>>Versions before 2026.3.0(exclusive)
cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
Civilized Discourse Construction Kit, Inc.
discourse
>>discourse>>Versions from 2026.1.0(inclusive) to 2026.1.2(exclusive)
cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
Civilized Discourse Construction Kit, Inc.
discourse
>>discourse>>Versions from 2026.2.0(inclusive) to 2026.2.1(exclusive)
cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*
Civilized Discourse Construction Kit, Inc.
discourse
>>discourse>>2026.3.0
cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:*
Weaknesses
CWE IDTypeSource
CWE-80Primarysecurity-advisories@github.com
CWE ID: CWE-80
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/discourse/discourse/commit/c4762a4fac2f61f52f325396b11d3aeb955ea925security-advisories@github.com
Patch
https://github.com/discourse/discourse/security/advisories/GHSA-h653-cq78-vjj2security-advisories@github.com
Vendor Advisory
Hyperlink: https://github.com/discourse/discourse/commit/c4762a4fac2f61f52f325396b11d3aeb955ea925
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/discourse/discourse/security/advisories/GHSA-h653-cq78-vjj2
Source: security-advisories@github.com
Resource:
Vendor Advisory
Change History
0Changes found
Details not found