Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.

CVE-2026-91119 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

Discourse is an open-source discussion platform. Prior to 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0, the topic small-action and nested-activity-log components interpolated the free-form action_code_who value into mention-link href attributes without URL encoding. A quote-bearing display name could terminate the intended URL attribute and inject attacker-controlled elements into the trusted rendered markup. Although the visible mention text was escaped, the unencoded path component allowed stored HTML injection when another user viewed the affected topic action or activity log. This issue is fixed in versions 2026.1.8, 2026.6.3, 2026.7.2, and 2026.8.0.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:5.4 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CNA: [email protected]CVSS-B:6.4 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://github.com/discourse/discourse/commit/20dbf112760eb1d6a58f2e49aeef7546898b6f1c	[email protected]	Source CodeVendor
https://github.com/discourse/discourse/commit/66653c484cfb91bc346f9a326f6945387f17b035	[email protected]	Source CodeVendor
https://github.com/discourse/discourse/commit/77a81c7a3a7ff9e94b355e32b8f379f2d389e05a	[email protected]	Source CodeVendor
https://github.com/discourse/discourse/commit/c4748f651d9d2f3a6dd3106a4d5564536c645168	[email protected]	Source CodeVendor
https://github.com/discourse/discourse/pull/42882	[email protected]	Issue TrackingVendor
https://github.com/discourse/discourse/security/advisories/GHSA-pv3p-p3m9-v8v3	[email protected]	AdvisoryRemedyVendor

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	[email protected]

Affected Products

Product	Versions
Discourse	>= 2026.1.0-latest (semver) >= 2026.6.0-latest (semver) >= 2026.7.0-latest (semver)
CPE cpe:2.3:a:discourse:discourse:::::::: Remediation Upgrade: 2026.1.8moderate effort Upgrade: 2026.6.3moderate effort Upgrade: 2026.7.2moderate effort Upgrade: 2026.8.0moderate effort

Change History

1 change record found show changes