CVE-2025-3645 | Moodle: idor in messaging web service allows access to some user details

A flaw was found in Moodle. Insufficient capability checks in a messaging web service allowed users to view other users' names and online statuses.

Published: 2025-04-25 Last update: 2025-06-24 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-3645 is rated Low Risk (26.5/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.10%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-3645

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-01 0.21% 0.10% -0.11%
2 2026-05-31 0.30% 0.21% -0.09%
3 2026-02-19 — 0.30% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-3645

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 1.4 [email protected]

Weakness enumeration for CVE-2025-3645

GitHub Security Advisory for CVE-2025-3645

GHSA-pj96-xh2w-fgqx · Severity: medium · Ecosystem: composer — Moodle has an IDOR in messaging web service which allows access to some user details

OS Trackers for CVE-2025-3645

vendor priority summary link
ubuntu medium CVE-2025-3645 medium priority: Ubuntu including 1 source packages (moodle), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream, xenial): DNE 6, needs-triage 3. https://ubuntu.com/security/CVE-2025-3645

Affected software / configurations for CVE-2025-3645

Vendor Product Version Raw CPE
moodle moodle < 4.1.18 cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle >= 4.3.0, < 4.3.12 cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle >= 4.4.0, < 4.4.8 cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
moodle moodle >= 4.5.0, < 4.5.4 cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*

References for CVE-2025-3645

cvelogic Threat Intelligence