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Discourse CVE-2026-72725

| EUVDEUVD-2026-55664 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-08-10 GitHub_M
XSS Discourse
5.4
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
vuln.today AI
5.4 MEDIUM

Stored XSS exploitable by any authenticated user (PR:L) targeting admin browser session (S:C, UI:R); no availability impact applies.

3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

3
Patch available
Aug 10, 2026 - 17:03 EUVD
Source Code Evidence Fetched
Aug 10, 2026 - 16:34 vuln.today
Analysis Generated
Aug 10, 2026 - 16:34 vuln.today

DescriptionCVE.org

Discourse is an open-source discussion platform. Prior to 2026.1.6, the staff action log model rendered unescaped previous and new value fields that could inject stored cross-site scripting into the staff interface. The issue is fixed in 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

AnalysisAI

Stored XSS in Discourse's staff action log interface allows authenticated users to inject malicious HTML into log entries that execute in administrator browser sessions. All Discourse releases prior to 2026.1.6 are affected, with the root cause being an unescaped rendering of previous_value and new_value fields in the admin frontend model. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated Discourse account (PR:L) with sufficient permissions to perform an action that generates a staff action log entry - for example, a user changing their display name via a change_name action, which is a default capability for regular users. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 5.4 score (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) accurately reflects the constrained exploitation path: a low-privileged authenticated user must be able to trigger a loggable action, and a staff member must subsequently view the action logs. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Discourse to a patched release: 2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0, as documented in the vendor advisory at https://github.com/discourse/discourse/security/advisories/GHSA-8x29-vv56-wj6v. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-72725 vulnerability details – vuln.today
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