#VU104026 Improper access control in Moodle - CVE-2025-26531

Vulnerability identifier: #VU104026

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-26531

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Moodle
Web applications / Other software

Vendor: moodle.org

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to the IDOR issue in badges. A remote user can disable badges they do not have permission to access.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Moodle: 4.1.0 - 4.1.15, 4.3.0 - 4.3.9, 4.4.0 - 4.4.5, 4.5.0 - 4.5.1

---

External links
https://moodle.org/mod/forum/discuss.php?d=466148
https://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-84239
https://github.com/advisories/GHSA-g88w-v4cq-qgcp

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.