CVE-2026-23511 (GCVE-0-2026-23511)

Vulnerability from cvelistv5 – Published: 2026-01-15 19:09 – Updated: 2026-01-15 19:56
VLAI
Title
ZITADEL has a user enumeration vulnerability in Login UIs
Summary
ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel's login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-15 19:56 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
zitadel zitadel Affected: >= 4.0.0, < 4.9.1
Affected: < 3.4.6
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-23511",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-15T19:56:17.482311Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-15T19:56:24.164Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "zitadel",
          "vendor": "zitadel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.0.0, \u003c 4.9.1"
            },
            {
              "status": "affected",
              "version": "\u003c 3.4.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel\u0027s login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-204",
              "description": "CWE-204: Observable Response Discrepancy",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-15T19:09:06.154Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264r",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264r"
        },
        {
          "name": "https://github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10dd2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10dd2"
        },
        {
          "name": "https://github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b858d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b858d"
        },
        {
          "name": "https://github.com/zitadel/zitadel/releases/tag/v3.4.6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zitadel/zitadel/releases/tag/v3.4.6"
        },
        {
          "name": "https://github.com/zitadel/zitadel/releases/tag/v4.9.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zitadel/zitadel/releases/tag/v4.9.1"
        }
      ],
      "source": {
        "advisory": "GHSA-pvm5-9frx-264r",
        "discovery": "UNKNOWN"
      },
      "title": "ZITADEL has a user enumeration vulnerability in Login UIs"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-23511",
    "datePublished": "2026-01-15T19:09:06.154Z",
    "dateReserved": "2026-01-13T18:22:43.979Z",
    "dateUpdated": "2026-01-15T19:56:24.164Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-23511",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-01-15T19:56:17.482311Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-01-15T19:56:21.421Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "zitadel",
              "vendor": "zitadel",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003e= 4.0.0, \u003c 4.9.1"
                },
                {
                  "status": "affected",
                  "version": "\u003c 3.4.6"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "ZITADEL is an open source identity management platform. Prior to 4.9.1 and 3.4.6, a user enumeration vulnerability has been discovered in Zitadel\u0027s login interfaces. An unauthenticated attacker can exploit this flaw to confirm the existence of valid user accounts by iterating through usernames and userIDs. This vulnerability is fixed in 4.9.1 and 3.4.6."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-204",
                  "description": "CWE-204: Observable Response Discrepancy",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-01-15T19:09:06.154Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264r",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-pvm5-9frx-264r"
            },
            {
              "name": "https://github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10dd2",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/zitadel/zitadel/commit/b85ab69e4679b0268e2b0e9b4cd04e934af10dd2"
            },
            {
              "name": "https://github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b858d",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/zitadel/zitadel/commit/c300d4cc6a2775ab17ddfe76492f24170f8b858d"
            },
            {
              "name": "https://github.com/zitadel/zitadel/releases/tag/v3.4.6",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/zitadel/zitadel/releases/tag/v3.4.6"
            },
            {
              "name": "https://github.com/zitadel/zitadel/releases/tag/v4.9.1",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/zitadel/zitadel/releases/tag/v4.9.1"
            }
          ],
          "source": {
            "advisory": "GHSA-pvm5-9frx-264r",
            "discovery": "UNKNOWN"
          },
          "title": "ZITADEL has a user enumeration vulnerability in Login UIs"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-23511",
        "datePublished": "2026-01-15T19:09:06.154Z",
        "dateReserved": "2026-01-13T18:22:43.979Z",
        "dateUpdated": "2026-01-15T19:56:24.164Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    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.