CVE-2026-102586
Moodle: xss via password reset link due to insufficient username escaping
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.
INFO
Published Date :
Sept. 30, 2026, 9:17 a.m.
Last Modified :
Oct. 1, 2026, 3:48 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Moodle to the latest version.
- Apply vendor-supplied security patches.
- Validate and sanitize all user inputs.
- Implement output encoding for displayed data.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-102586.
| URL | Resource |
|---|---|
| http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-88335 | Patch |
| https://access.redhat.com/security/cve/CVE-2026-102586 | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2543641 | Issue Tracking Third Party Advisory |
| https://moodle.org/mod/forum/discuss.php?d=482504 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-102586 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-102586
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-102586 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-102586 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Oct. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* versions up to (excluding) 4.5.13 *cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* versions from (including) 5.0.0 up to (excluding) 5.0.9 *cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* versions from (including) 5.1.0 up to (excluding) 5.1.6 *cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* versions from (including) 5.2.0 up to (excluding) 5.2.2 Added Reference Type Fedora Project: http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-88335 Types: Patch Added Reference Type Fedora Project: https://access.redhat.com/security/cve/CVE-2026-102586 Types: Third Party Advisory Added Reference Type Fedora Project: https://bugzilla.redhat.com/show_bug.cgi?id=2543641 Types: Issue Tracking, Third Party Advisory Added Reference Type Fedora Project: https://moodle.org/mod/forum/discuss.php?d=482504 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 30, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-102586', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-30T13:56:33.265497Z'} -
New CVE Received by [email protected]
Sep. 30, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N Added CWE CWE-79 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/102xxx/CVE-2026-102586.json">CVE-2026-102586</a> Added Reference http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-88335 Added Reference https://access.redhat.com/security/cve/CVE-2026-102586 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2543641 Added Reference https://moodle.org/mod/forum/discuss.php?d=482504