CVE-2025-26527Network attack vector

Tag metadata disclosure via unfiltered collections

Published Feb 24, 2025 · Updated Feb 24, 2025

Information disclosure in affected Moodle LMS 4.1, 4.3, 4.4, and 4.5 releases allows remote attackers to discover hidden tag names. The core_tag_collection::get_tag_cloud method accepted a requested collection identifier without intersecting it with searchable collections, and the tags block also listed unsearchable collections. No authentication or user interaction is required, but the disclosed data is limited to tag metadata rather than the tagged resources themselves.

CVSS severity5.3
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in affected Moodle LMS 4.1, 4.3, 4.4, and 4.5 releases allows remote attackers to discover hidden tag names. The core_tag_collection::get_tag_cloud method accepted a requested collection identifier without intersecting it with searchable collections, and the tags block also listed unsearchable collections. No authentication or user interaction is required, but the disclosed data is limited to tag metadata rather than the tagged resources themselves.

The record

CVE
CVE-2025-26527
Published
Feb 24, 2025
Updated
Feb 24, 2025
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-1230, T1594
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.1.0 <4.1.16
  2. Affected versionversion=4.3.0 <4.3.10
  3. Affected versionversion=4.4.0 <4.4.6
  4. Affected versionversion=4.5.0 <4.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moodle · Moodle LMSversion=4.1.0 <4.1.16; version=4.3.0 <4.3.10; version=4.4.0 <4.4.6; version=4.5.0 <4.5.2

Published CVSS scores

5.3Fedora ProjectCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1230Exposure of Sensitive Information Through Metadata
T1594Search Victim-Owned Websites

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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