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CVE-2023-23923

21
FAUCET Score

CVE-2023-23923 is a high-severity vulnerability in Moodle that allows a remote attacker to gain unauthorized access to restricted functionality by manipulating a user's "start page" preference. This vulnerability has a CVSS score of 8.2, indicating a critical impact with high confidentiality and low integrity risks, and can be exploited remotely without user interaction. While no public exploit code or active exploitation has been observed, its high severity warrants prompt attention.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.9.0, < 3.9.19CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
>= 3.11.0, < 3.11.12CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
>= 4.0.0, < 4.0.6CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
4.1.0CPE matchmatch criteria
cpe:2.3:a:moodle:moodle:4.1.0:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.2HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
4.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.96%
Probability of exploitation in next 30 days
EPSS Percentile
57.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0096 is in the 32nd percentile among its peer group of 51,551 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, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 3.9.19
composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 3.11.12
composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 4.0.6
composerpatch availablevia ghsa
Product: moodle/moodleFixed in: 4.1.1

Vendor Advisories (1)

composerGHSA-32jc-9p58-p82xhigh

Moodle Improper Access Control vulnerability

Feb 17, 2023

References

git.moodle.org / gw
Patch
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
moodle.org / mod/forum/discuss.php
Vendor Advisory