CVE-2025-67850
Published: 03 February 2026
Summary
CVE-2025-67850 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Moodle Moodle. Its CVSS base score is 7.3 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 4.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.
Validates web inputs to reject script-related content that could produce XSS.
Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
XSS in public-facing Moodle web app directly enables T1190 exploitation and JS injection/execution via T1059.007.
NVD Description
A flaw was found in moodle. This vulnerability, known as Cross-Site Scripting (XSS), occurs due to insufficient checks on user-provided data in the formula editor's arithmetic expression fields. A remote attacker could inject malicious code into these fields. When other…
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users view these expressions, the malicious code would execute in their web browsers, potentially compromising their data or leading to unauthorized actions.
Deeper analysisAI
CVE-2025-67850 is a Cross-Site Scripting (XSS) vulnerability, classified under CWE-79, affecting Moodle. The flaw arises from insufficient validation of user-provided data in the formula editor's arithmetic expression fields, allowing malicious code injection. Published on 2026-02-03, it carries a CVSS v3.1 base score of 7.3 (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N).
A remote attacker with low privileges (PR:L) can exploit this vulnerability over the network with low complexity by injecting malicious scripts into the arithmetic expression fields. When other users view these expressions, the injected code executes in their web browsers, potentially compromising confidential data or enabling unauthorized actions, though it requires user interaction (UI:R) and does not impact availability.
Mitigation details are available in the referenced advisories, including the Red Hat security page at https://access.redhat.com/security/cve/CVE-2025-67850 and the Bugzilla tracker at https://bugzilla.redhat.com/show_bug.cgi?id=2423838.
Details
- CWE(s)