CVE-2025-26527: Moodle/moodle Moodle's Non-searchable Tags Can Still Vulnerability

MODERATE
Advisory Identifier: GHSA-5r85-6h7f-rg3r
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CVSS 5.3
CWE-1230
Published
Advisory Summary

CVE-2025-26527 is a MODERATE (CVSS 5.3) moodle's non-searchable tags can still vulnerability (CWE-1230: Exposure of Sensitive Information Through Metadata) affecting Moodle/moodle libraries in the Packagist ecosystem. The issue involves moodle's non-searchable tags can still be discovered on the tag search page and in the tags block. Remediation is available by upgrading affected packages to version 4.5.2, 4.4.6, 4.3.10, 4.1.16.

CVE-2025-26527 at a Glance

CVE Identifier CVE-2025-26527
GHSA Identifier GHSA-5r85-6h7f-rg3r
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-1230: Exposure of Sensitive Information Through Metadata
Affected Product Moodle/moodle
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2025-26527

To remediate this vulnerability, upgrade all affected Moodle/moodle dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

moodle/moodle fixed: 4.5.2 
Upgrade moodle/moodle to 4.5.2
moodle/moodle fixed: 4.4.6 
Upgrade moodle/moodle to 4.4.6
moodle/moodle fixed: 4.3.10 
Upgrade moodle/moodle to 4.3.10
moodle/moodle fixed: 4.1.16 
Upgrade moodle/moodle to 4.1.16
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for moodle/moodle

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-26527, inspect your project dependencies for Moodle/moodle:

inspect dependencies for moodle/moodle

Analyze the terminal output to locate any version of Moodle/moodle in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.5.2), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1230: Exposure of Sensitive Information Through Metadata, where the product prevents direct access to a resource containing sensitive information, but it does not sufficiently limit access to metadata that is derived from the original, sensitive information. In Moodle/moodle, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Tags not expected to be visible to a user could still be discovered by them via the tag search page or in the tags block.

CVE-2025-26527 Affected Moodle/moodle Versions

4 component(s)
Fixed Versions:
4.5.24.4.64.3.104.1.16
Product / Package Ecosystem Affected Versions Fixed Version
moodle/moodle
 Packagist
≥ 4.5.0-beta
< 4.5.2
4.5.2
moodle/moodle
 Packagist
≥ 4.4.0-beta
< 4.4.6
4.4.6
moodle/moodle
 Packagist
≥ 4.3.0-beta
< 4.3.10
4.3.10
moodle/moodle
 Packagist
< 4.1.16
4.1.16

References

NVD — CVE-2025-26527 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-26527
Moodle/moodle Source Repository REPOSITORY
https://github.com/moodle/moodle
moodle.org/mod/forum/discuss.p... WEB
https://moodle.org/mod/forum/discuss.php?d=466143
git.moodle.org/gw WEB
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-83941

Frequently Asked Questions

What is CVE-2025-26527?
CVE-2025-26527 is a security vulnerability in Moodle/moodle involving Moodle's non-searchable tags can still be discovered on the tag search page and in the tags block under CWE-1230: Exposure of Sensitive Information Through Metadata.
Which Moodle/moodle versions are affected?
Affected versions include releases prior to 4.5.2, 4.4.6, 4.3.10, 4.1.16 across affected packages: moodle/moodle.
What version fixes CVE-2025-26527?
Upgrading to 4.5.2, 4.4.6, 4.3.10, 4.1.16 (or the latest patched release for your respective branch) resolves the vulnerability.
Is moodle/moodle affected?
Yes, moodle/moodle is affected in releases prior to 4.5.2, 4.4.6, 4.3.10, 4.1.16. Upgrade your dependency to 4.5.2, 4.4.6, 4.3.10, 4.1.16 or later.
What is the CVSS score of CVE-2025-26527?
CVE-2025-26527 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2025-26527?
CVE-2025-26527 is classified under CWE-1230: Exposure of Sensitive Information Through Metadata (The product prevents direct access to a resource containing sensitive information, but it does not sufficiently limit access to metadata that is derived from the original, sensitive information.).
How can I check Packagist dependencies for CVE-2025-26527?
Run the dependency tree command: 'inspect dependencies for moodle/moodle'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5r85-6h7f-rg3r",
  "modified" : "2025-02-24T22:02:18Z",
  "published" : "2025-02-24T21:31:44Z",
  "aliases" : [ "CVE-2025-26527" ],
  "summary" : "Moodle's non-searchable tags can still be discovered on the tag search page and in the tags block",
  "details" : "Tags not expected to be visible to a user could still be discovered by them via the tag search page or in the tags block.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.5.0-beta"
      }, {
        "fixed" : "4.5.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.4.0-beta"
      }, {
        "fixed" : "4.4.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.3.0-beta"
      }, {
        "fixed" : "4.3.10"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.1.16"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-26527"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/moodle/moodle"
  }, {
    "type" : "WEB",
    "url" : "https://moodle.org/mod/forum/discuss.php?d=466143"
  }, {
    "type" : "WEB",
    "url" : "http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-83941"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1230" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-02-24T22:02:18Z",
    "nvd_published_at" : "2025-02-24T20:15:33Z"
  }
}