CVE-2026-102586

MEDIUM 4.3

Moodle: xss via password reset link due to insufficient username escaping

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

A flaw was found in Moodle. Insufficient sanitization of username input on the password reset page allows a remote attacker to conduct a cross-site scripting (XSS) attack. By convincing an unauthenticated user to access a specially crafted password reset link, an attacker could execute arbitrary script in the victim's browser.

CWE	CWE-79
Published	Sep 30, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

None

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-88335 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-102586 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2543641 moodle.org: https://moodle.org/mod/forum/discuss.php?d=482504

Credits

Upstream acknowledges Henk van den Toorn as the original reporter.