---
title: "CVE-2026-29191: ZITADEL has 1-Click Account Takeover via XSS in /saml-post Endpoint"
url: https://erroneo.us/security/cve/CVE-2026-29191/
description: "CVE-2026-29191 (github.com/zitadel/zitadel (Go)): ZITADEL is an open source identity management platform. From version 4.0.0 to 4.11.1, a vulnerability in…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-07
date_modified: 2026-03-09
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-29191"
kev: false
cvss: 9.3
epss: 0.00399
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-29191: ZITADEL has 1-Click Account Takeover via XSS in /saml-post Endpoint

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.4% , percentile 33: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 33% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
- Only applies if your dependency tree includes github.com/zitadel/zitadel (Go) >= 4.0.0, < 4.12.0, fixed in 4.12.0 ; github.com/zitadel/zitadel/v2 (Go) >= 4.0.0, < 4.12.0, fixed in 4.12.0 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Go `github.com/zitadel/zitadel` >= 4.0.0, < 4.12.0 → fixed: 4.12.0
- Go `github.com/zitadel/zitadel/v2` >= 4.0.0, < 4.12.0 → fixed: 4.12.0

## Affected products (CVE record)

- zitadel zitadel: >= 4.0.0, < 4.12.0

## Severity

- GitHub_M CVSS 3.1: 9.3 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.3 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.40% probability of exploitation activity in the next 30 days; percentile 33.

## Sources

- [GitHub Advisory GHSA-pr34-2v5x-6qjq](https://github.com/advisories/GHSA-pr34-2v5x-6qjq)
- [CVE.org record CVE-2026-29191](https://www.cve.org/CVERecord?id=CVE-2026-29191)
- [NVD entry CVE-2026-29191](https://nvd.nist.gov/vuln/detail/CVE-2026-29191)
- [github.com](https://github.com/zitadel/zitadel/security/advisories/GHSA-pr34-2v5x-6qjq)

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Source page: https://erroneo.us/security/cve/CVE-2026-29191/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt