CVE-2026-102586

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

MEDIUM

6.1

CVSS Score

Published: September 30, 2026 at 08:36 AM UTC

Updated: October 1, 2026 at 03:48 PM UTC

1 product affected across 1 vendorMoodle

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Severity

MEDIUM6.1

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Moodle · Moodle

95%

v < 4.5.135.0.0 ≤ v < 5.0.95.1.0 ≤ v < 5.1.65.2.0 ≤ v < 5.2.2

Affected range stops below 4.5.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.0.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.1.6, so it looks safe — our inference, not a vendor statement

Affected range stops below 5.2.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Patch

Source: cverecord

http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-88335

VDB Entryx_refsource_REDHATThird Party Advisory

Source: cverecord

https://access.redhat.com/security/cve/CVE-2026-102586

Issue Trackingx_refsource_REDHATThird Party Advisory

Source: cverecord

https://bugzilla.redhat.com/show_bug.cgi?id=2543641

Vendor Advisory

Source: cverecord

https://moodle.org/mod/forum/discuss.php?d=482504

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-79

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