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CVE-2025-53021

Published: Jun 24, 2025Updated: Jul 9, 2025 Sources: CVE List NVD GHSA BDUCWE-384
NVD MITRE
4.2CVSSMEDIUM
EPSS Score
0.3%
Top 82.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

A session fixation vulnerability in Moodle 3.x through 3.11.18 allows unauthenticated attackers to hijack user sessions via the sesskey parameter. The sesskey can be obtained without authentication and reused within the OAuth2 login flow, resulting in the victim's session being linked to the attacker's. Successful exploitation results in full account takeover. According to the Moodle Releases page, "Bug fixes for security issues in 3.11.x ended 11 December 2023." NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-384

Affected Products

moodlemoodle
On-premWeb App
Web & CMS Plugins / cms-core
moodle/moodlePackagist
Web App
Web & CMS Plugins / cms-core
MoodleMoodle
On-premWeb App
Web & CMS Plugins / cms-core
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
MoodleМартин ДогиамасWeb & CMS Plugins
moodleoss-projectAUWeb & CMS Pluginsaka jmol plugin, lms
packagistpackage-ecosystemOSS Libraries
ооо «ред софт»commercialRUOperating Systemsaka red soft
мартин догиамасindividual-devAUWeb & CMS Pluginsaka martin dogiamas

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Defense Evasion
Initial Access
View detailed technique mapping

References

https://github.com/moodle/moodle/releases/tag/v3.11.18
github.com
https://moodledev.io/general/releases#moodle-311
moodledev.io
https://rentry.co/moodle-oauth2-cve
rentry.co
and 5 more references View all →

Timeline

Published
Jun 24, 2025
Last Updated
Jul 9, 2025

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