Vulnerability-Lookup

(CVE-2026-73476)

Vulnerability from drupal – Published: 2026-08-12 17:56 – Updated: 2026-08-13 17:59 – Source website

Details

This module enables you to authenticate Drupal users against external identity providers.

The module does not sufficiently ensure exact matching of externally supplied identity values when storing and looking up authentication mappings under certain database collation configurations.

This vulnerability is minimally mitigated by the fact that it affects only sites using impacted MySQL or MariaDB collation settings for the module’s authentication mapping storage. Affected collations are quite common so all sites are encouraged to upgrade.

Credits

晉宇林 (whale120) www.drupal.org/u/whale120

References

URL

Type

https://www.drupal.org/sa-contrib-2026-098

WEB

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "affected_versions": "\u003c2.0.13"
      },
      "package": {
        "ecosystem": "Packagist:https://packages.drupal.org/8",
        "name": "drupal/externalauth"
      },
      "ranges": [
        {
          "database_specific": {
            "constraint": "\u003c2.0.13"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "severity": []
    }
  ],
  "aliases": [
    "CVE-2026-73476"
  ],
  "credits": [
    {
      "contact": [
        "https://www.drupal.org/u/whale120"
      ],
      "name": "\u6649\u5b87 \u6797 (whale120)"
    }
  ],
  "details": "This module enables you to authenticate Drupal users against external identity providers.\n\nThe module does not sufficiently ensure exact matching of externally supplied identity values when storing and looking up authentication mappings under certain database collation configurations.\n\nThis vulnerability is minimally mitigated by the fact that it affects only sites using impacted MySQL or MariaDB collation settings for the module\u2019s authentication mapping storage. Affected collations are quite common so all sites are encouraged to upgrade.",
  "id": "DRUPAL-CONTRIB-2026-098",
  "modified": "2026-08-13T17:59:58.000Z",
  "published": "2026-08-12T17:56:03.000Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://www.drupal.org/sa-contrib-2026-098"
    }
  ],
  "schema_version": "1.7.0"
}

CVE-2026-73476 (GCVE-0-2026-73476)

Vulnerability from cvelistv5 – Published: 2026-09-02 12:32 – Updated: 2026-09-02 18:38

Title

External Authentication - Moderately critical - Access bypass - SA-CONTRIB-2026-098

Summary

Improper Handling of Case Sensitivity vulnerability in Drupal External Authentication allows Privilege Escalation. This issue affects External Authentication versions: from 0.0.0 to 2.0.13.

Severity

5.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-02 18:38 UTC

CWE

CWE-178 - Improper Handling of Case Sensitivity

Assigner

drupal mitre root

References

1 reference

URL	Tags
https://www.drupal.org/sa-contrib-2026-098

Impacted products

1 product

Vendor	Product	Version
Drupal	External Authentication	Affected: 0.0.0 , < 2.0.13 (semver)

Date Public

2026-08-12 17:56

Credits

æå® æ (whale120) Sven Decabooter (svendecabooter) Swan Kalata (akalata) Neil Drumm (drumm) Greg Knaddison (greggles) Juraj Nemec (poker10)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 5.4,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-73476",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-02T18:38:36.672968Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-02T18:38:42.486Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://www.drupal.org/project/externalauth",
          "product": "External Authentication",
          "repo": "https://git.drupalcode.org/project/externalauth",
          "vendor": "Drupal",
          "versions": [
            {
              "lessThan": "2.0.13",
              "status": "affected",
              "version": "0.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "\u00e6\u0099\u0089\u00e5\u00ae\u0087 \u00e6\u009e\u0097 (whale120)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Sven Decabooter (svendecabooter)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Swan Kalata (akalata)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Neil Drumm (drumm)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Greg Knaddison (greggles)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "Juraj Nemec (poker10)"
        }
      ],
      "datePublic": "2026-08-12T17:56:03.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Improper Handling of Case Sensitivity vulnerability in Drupal External Authentication allows Privilege Escalation. This issue affects External Authentication versions: from 0.0.0 to 2.0.13."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-233",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-233 Privilege Escalation"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-178",
              "description": "CWE-178 Improper Handling of Case Sensitivity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-02T12:32:38.621Z",
        "orgId": "2c85b837-eb8b-40ed-9d74-228c62987387",
        "shortName": "drupal"
      },
      "references": [
        {
          "url": "https://www.drupal.org/sa-contrib-2026-098"
        }
      ],
      "title": "External Authentication - Moderately critical - Access bypass - SA-CONTRIB-2026-098"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2c85b837-eb8b-40ed-9d74-228c62987387",
    "assignerShortName": "drupal",
    "cveId": "CVE-2026-73476",
    "datePublished": "2026-09-02T12:32:38.621Z",
    "dateReserved": "2026-08-12T17:21:18.776Z",
    "dateUpdated": "2026-09-02T18:38:42.486Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.