CVE-2021-36394 — Vulnerability in moodle/moodle — CVE Details

CRITICAL

Moodle Session Fixation vulnerability

Published March 6, 2023Updated March 6, 2025Source: osv

Summary

In Moodle, a remote code execution risk was identified in the Shibboleth authentication plugin.

Advisory Timeline

First published March 6, 2023 (1316 days ago).
Last revised March 6, 2025 — 731 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer

Update moodle/moodle to 3.10.5 or later

composer require "moodle/moodle:^3.10.5"

Composer

Update moodle/moodle to 3.11.1 or later

composer require "moodle/moodle:^3.11.1"

Composer

Update moodle/moodle to 3.9.8 or later

composer require "moodle/moodle:^3.9.8"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: packagist (1).

Package	Ecosystem	Affected	Fixed In
moodle/moodle	packagist	v3.10.0, v3.10.0-beta, v3.10.0-rc1, v3.10.0-rc2 (+4 more)	3.10.5
moodle/moodle	packagist	v3.11.0, v3.11.0-beta, v3.11.0-rc1, v3.11.0-rc2	3.11.1
moodle/moodle	packagist	v2.3.10, v2.3.11, v2.3.4, v2.3.5 (+251 more)	3.9.8

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-384
View on MITRE
CWE-94
Code InjectionMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

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

References

https://nvd.nist.gov/vuln/detail/CVE-2021-36394
ADVISORY
https://github.com/moodle/moodle
PACKAGE
https://moodle.org/mod/forum/discuss.php?d=424799
WEB

Frequently Asked Questions

What is CVE-2021-36394?: Moodle Session Fixation vulnerability This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2021-36394?: CVE-2021-36394 affects moodle/moodle. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-36394 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-2563-fp9c-mgm8

BIT-moodle-2021-36394

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