Vulnerability-Lookup

ubuntu-cve-2025-53021

Vulnerability from osv_ubuntu

Published

2025-06-24 20:15

Modified

2025-10-24 05:23

Summary

Details

A session fixation vulnerability in Moodle 3.x through 3.11.18 allows unauthenticated attackers to hijack user sessions via the sesskey parameter. The sesskey can be obtained without authentication and reused within the OAuth2 login flow, resulting in the victim's session being linked to the attacker's. Successful exploitation results in full account takeover. According to the Moodle Releases page, "Bug fixes for security issues in 3.11.x ended 11 December 2023." NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Severity

4.2 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2025-53021	REPORT
	https://www.cve.org/CVERecord?id=CVE-2025-53021	REPORT
	https://github.com/moodle/moodle/releases/tag/v3.11.18	REPORT
	https://moodledev.io/general/releases#moodle-311	REPORT
	https://rentry.co/moodle-oauth2-cve	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "moodle",
            "binary_version": "3.0.3+dfsg-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "moodle",
        "purl": "pkg:deb/ubuntu/moodle@3.0.3+dfsg-0ubuntu1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.7.9+dfsg-1",
        "2.7.10+dfsg-1",
        "2.7.11+dfsg-1",
        "2.7.11+dfsg-2",
        "2.7.12+dfsg-1",
        "3.0.3+dfsg-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "moodle",
            "binary_version": "3.0.3+dfsg-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "moodle",
        "purl": "pkg:deb/ubuntu/moodle@3.0.3+dfsg-0ubuntu1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.3+dfsg-0ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "A session fixation vulnerability in Moodle 3.x through 3.11.18 allows unauthenticated attackers to hijack user sessions via the sesskey parameter. The sesskey can be obtained without authentication and reused within the OAuth2 login flow, resulting in the victim\u0027s session being linked to the attacker\u0027s. Successful exploitation results in full account takeover. According to the Moodle Releases page, \"Bug fixes for security issues in 3.11.x ended 11 December 2023.\" NOTE: This vulnerability only affects products that are no longer supported by the maintainer.",
  "id": "UBUNTU-CVE-2025-53021",
  "modified": "2025-10-24T05:23:35Z",
  "published": "2025-06-24T20:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-53021"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-53021"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/moodle/moodle/releases/tag/v3.11.18"
    },
    {
      "type": "REPORT",
      "url": "https://moodledev.io/general/releases#moodle-311"
    },
    {
      "type": "REPORT",
      "url": "https://rentry.co/moodle-oauth2-cve"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-53021"
  ]
}

CVE-2025-53021 (GCVE-0-2025-53021)

Vulnerability from cvelistv5 – Published: 2025-06-24 00:00 – Updated: 2025-06-24 19:46 Unsupported When Assigned

Summary

Severity

4.2 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-24 19:46 UTC

CWE

CWE-384 - Session Fixation

Assigner

mitre mitre root

References

3 references

URL	Tags
https://rentry.co/moodle-oauth2-cve
https://github.com/moodle/moodle/releases/tag/v3.11.18
https://moodledev.io/general/releases#moodle-311

Impacted products

1 product

Vendor	Product	Version
Moodle	Moodle	Affected: 3 , ≤ 3.11.18 (custom) cpe:2.3:a:moodle:moodle::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-53021",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-06-24T19:46:30.849426Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-06-24T19:46:49.641Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Moodle",
          "vendor": "Moodle",
          "versions": [
            {
              "lessThanOrEqual": "3.11.18",
              "status": "affected",
              "version": "3",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "3.11.18",
                  "versionStartIncluding": "3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A session fixation vulnerability in Moodle 3.x through 3.11.18 allows unauthenticated attackers to hijack user sessions via the sesskey parameter. The sesskey can be obtained without authentication and reused within the OAuth2 login flow, resulting in the victim\u0027s session being linked to the attacker\u0027s. Successful exploitation results in full account takeover. According to the Moodle Releases page, \"Bug fixes for security issues in 3.11.x ended 11 December 2023.\" NOTE: This vulnerability only affects products that are no longer supported by the maintainer."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 4.2,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-384",
              "description": "CWE-384 Session Fixation",
              "lang": "en",
              "type": "CWE"
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-24T19:22:54.821Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://rentry.co/moodle-oauth2-cve"
        },
        {
          "url": "https://github.com/moodle/moodle/releases/tag/v3.11.18"
        },
        {
          "url": "https://moodledev.io/general/releases#moodle-311"
        }
      ],
      "tags": [
        "unsupported-when-assigned"
      ],
      "x_generator": {
        "engine": "enrichogram 0.0.1"
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "mitre",
    "cveId": "CVE-2025-53021",
    "datePublished": "2025-06-24T00:00:00.000Z",
    "dateReserved": "2025-06-24T00:00:00.000Z",
    "dateUpdated": "2025-06-24T19:46:49.641Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.