Vulnerability-Lookup

CVE-2026-29191 (GCVE-0-2026-29191)

Vulnerability from cvelistv5 – Published: 2026-03-07 15:07 – Updated: 2026-03-09 20:44

Title

ZITADEL: 1-Click Account Takeover via XSS in /saml-post Endpoint

Summary

ZITADEL is an open source identity management platform. From version 4.0.0 to 4.11.1, a vulnerability in Zitadel's login V2 interface was discovered that allowed a possible account takeover via XSS in /saml-post Endpoint. This issue has been patched in version 4.12.0.

Severity ?

9.3 (Critical)


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

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

URL

Tags

https://github.com/zitadel/zitadel/security/advis…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	zitadel	zitadel	Affected: >= 4.0.0, < 4.12.0

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-29191

Vulnerability from fkie_nvd - Published: 2026-03-07 15:15 - Updated: 2026-03-10 17:55

Severity ?

9.3 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/zitadel/zitadel/security/advisories/GHSA-pr34-2v5x-6qjq	Patch, Vendor Advisory

Impacted products

	Vendor	Product	Version
	zitadel	zitadel	*

JSON

To clipboard

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    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*",
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    },
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      "lang": "es",
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    }
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  "lastModified": "2026-03-10T17:55:39.263",
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GHSA-PR34-2V5X-6QJQ

Vulnerability from github – Published: 2026-03-04 22:47 – Updated: 2026-03-09 15:48

Summary

ZITADEL has 1-Click Account Takeover via XSS in /saml-post Endpoint

Details

Summary

A vulnerability was discovered in Zitadel's login V2 interface that allowed a possible account takeover.

Impact

Zitadel exposes an HTTP endpoint named /saml-post. This endpoint is used for handling requests to SAML IdPs and accepts two HTTP GET parameters: url and id. When these parameters are supplied, users’ browsers auto-submit an HTTP POST request to the provided url parameter.

The endpoint insecurely redirects users using the provided url GET parameter. As a result, by specifying a javascript: scheme, malicious JS code could be executed on Zitadel users’ browsers.

The endpoint also reflects user-supplied input in the server response, without HTML-encoding it. As a result, it is possible to inject arbitrary HTML code, which again leads to malicious JS code execution in the Zitadel users’ browsers.

An unauthenticated remote attacker can exploit these XSS vulnerabilities, and thus, execute malicious JavaScript code on behalf of Zitadel users. By doing so, such an attacker could reset the password of their victims, and take over their accounts.

It's important to note that this specific attack vector is mitigated for accounts that have Multi-Factor Authentication (MFA) or Passwordless authentication enabled.

Affected Versions

Systems running one of the following versions are affected: - 4.x: 4.0.0 through 4.11.1 (including RC versions)

Important Note: Although this /saml-post endpoint is used when Zitadel is integrated with a SAML Identity Provider (IdP), the vulnerability in this finding does not require Zitadel to be configured with a SAML IdP. Consequently, Zitadel is vulnerable in its default, out-of-the-box configuration.

Patches

The vulnerability has been addressed in the latest releases. The patch reworked the integration of SAML IdPs and the /saml-post endpoint no longer exists. Additionally, the page to change the password, now always requires the user's current password regardless of the state of the authenticated session.

4.x: Upgrade to >= 4.12.0

Workarounds

The recommended solution is to upgrade to a patched version. If an upgrade is not possible and no SAML IdP integration is needed, a WAF or reverse proxy rule can be deployed to prevent access to the endpoint.

Questions

If there are any questions or comments about this advisory, please email them to security@zitadel.com

Credits

ZITADEL extends thanks once again to Amit Laish from GE Vernova for finding and reporting the vulnerability.

Severity ?

9.3 (Critical)


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

Show details on source website

JSON

To clipboard

{
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    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/zitadel/zitadel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.12.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/zitadel/zitadel/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.12.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-29191"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-04T22:47:08Z",
    "nvd_published_at": "2026-03-07T15:15:55Z",
    "severity": "CRITICAL"
  },
  "details": "### Summary\n\nA vulnerability was discovered in Zitadel\u0027s login V2 interface that allowed a possible account takeover.\n\n### Impact\n\nZitadel exposes an HTTP endpoint named /saml-post. This endpoint is used for handling requests to SAML IdPs and accepts two HTTP GET parameters: url and id. When these parameters are supplied, users\u2019 browsers auto-submit an HTTP POST request to the provided url parameter.\n \nThe endpoint insecurely redirects users using the provided url GET parameter. As a result, by specifying a javascript: scheme, malicious JS code could be executed on Zitadel users\u2019 browsers. \n\nThe endpoint also reflects user-supplied input in the server response, without HTML-encoding it. As a result, it is possible to inject arbitrary HTML code, which again leads to malicious JS code execution in the Zitadel users\u2019 browsers.\n\nAn unauthenticated remote attacker can exploit these XSS vulnerabilities, and thus, execute malicious JavaScript code on behalf of Zitadel users. By doing so, such an attacker could reset the password of their victims, and take over their accounts.\n\nIt\u0027s important to note that this specific attack vector is mitigated for accounts that have Multi-Factor Authentication (MFA) or Passwordless authentication enabled.\n\n### Affected Versions\n\nSystems running one of the following versions are affected:\n- **4.x**: `4.0.0` through `4.11.1` (including RC versions)\n \nImportant Note: Although this /saml-post endpoint is used when Zitadel is integrated with a SAML Identity Provider (IdP), the vulnerability in this finding does not require Zitadel to be configured with a SAML IdP. Consequently, Zitadel is vulnerable in its default, out-of-the-box configuration.\n\n### Patches\n\nThe vulnerability has been addressed in the latest releases. The patch reworked the integration of SAML IdPs and the /saml-post endpoint no longer exists. Additionally, the page to change the password, now always requires the user\u0027s current password regardless of the state of the authenticated session.\n\n4.x: Upgrade to \u003e= [4.12.0](https://github.com/zitadel/zitadel/releases/tag/v4.12.0)\n\n### Workarounds\n\nThe recommended solution is to upgrade to a patched version. If an upgrade is not possible and no SAML IdP integration is needed, a WAF or reverse proxy rule can be deployed to prevent access to the endpoint.\n\n### Questions\n\nIf there are any questions or comments about this advisory, please email them to [security@zitadel.com](mailto:security@zitadel.com)\n\n### Credits\n\nZITADEL extends thanks once again to Amit Laish from GE Vernova for finding and reporting the vulnerability.",
  "id": "GHSA-pr34-2v5x-6qjq",
  "modified": "2026-03-09T15:48:27Z",
  "published": "2026-03-04T22:47:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-pr34-2v5x-6qjq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29191"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/zitadel/zitadel"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ZITADEL has 1-Click Account Takeover via XSS in /saml-post Endpoint"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2026-29191 (GCVE-0-2026-29191)

FKIE_CVE-2026-29191

GHSA-PR34-2V5X-6QJQ

Summary

Impact

Affected Versions

Patches

Workarounds

Questions

Credits

Tags

Sightings

Nomenclature