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CVE-2015-5331

14
FAUCET Score

CVE-2015-5331 describes a vulnerability in Moodle 2.9.x before 2.9.3 where the messaging API fails to adequately validate contact lists, enabling authenticated users to bypass access controls and conduct spam attacks. This medium-severity vulnerability has a CVSS score of 4.3, indicating a network-based attack with low complexity and a potential impact of limited integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.9.0CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:2.9.0:*:*:*:*:*:*:*
2.9.1CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:2.9.1:*:*:*:*:*:*:*
2.9.2CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:2.9.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

4.3MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.28%
Probability of exploitation in next 30 days
EPSS Percentile
67.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0128 is in the 81st percentile among its peer group of 21,924 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 2.9.3

Vendor Advisories (1)

composerGHSA-m7cc-6vhg-39wrmedium

Moodle improper access control

May 13, 2022

References

git.moodle.org / gw
moodle.org / mod/forum/discuss.php
Vendor Advisory