CVE-2026-102581

MEDIUM 4.6

Moodle: xss in forum post templates due to insufficient escaping

CVSS Score

4.6

EPSS Score

0.0%

EPSS Percentile

0th

A flaw was found in Moodle. Insufficient output escaping in templates used to display forum posts enables a stored cross-site scripting (XSS) vulnerability. An attacker can inject malicious content into a forum post, which then executes arbitrary script code in the browser of another user viewing the affected post.

CWE	CWE-79
Published	Sep 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

References

NVD ↗ CVE.org ↗ EPSS Data ↗

git.moodle.org: http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-88981 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-102581 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2543634 moodle.org: https://moodle.org/mod/forum/discuss.php?d=482499

Credits

Upstream acknowledges Lars Bonczek as the original reporter.