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🛡️ CVE-2026-27945 — zitadel

🟡 CVSS 6.5 — Medium ✅ No Known Exploit NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

ZITADEL has potential SSRF via Actions

Summary

ZITADEL Action V2 (introduced as early preview in 2.59.0, beta in 3.0.0 and GA in 4.0.0) is a webhook based approach to allow developers act on API request to Zitadel and customize flows such the issue of a token.

ZITADEL's Action target URLs can point to local hosts, potentially allowing adversaries to gather internal network information and connect to internal services.

Impact

When the URL points to a local host / IP address, an adversary might gather information about the internal network structure, the services exposed on internal hosts etc. This is sometimes called a Server-Side Request Forgery (SSRF).

ZITADEL Actions expect responses according to specific schemas, which reduces the threat vector.

Affected Versions

Systems running one of the following versions are affected:

  • 4.x: 4.0.0 through 4.11.0 (including RC version)
  • 3.x: 3.0.0 to 3.4.6 (including RC versions)
  • 2.x: 2.59.0 to 2.71.19

Patches

The vulnerability has been addressed in the latest releases. The patch resolves the issue by checking the target URL against a denylist. By default localhost, resp. loopback IPs are denied.

Note that this fix was only released on v4.x. Due to the stage (preview / beta) in which the functionality was in v2.x and v3.x, the changes that have been applied to it since then and the severity, respectively the actual thread vector, a backport to the corresponding versions was not feasible. Please check the workaround section for alternative solutions if an upgrade to v4.x is not possible.

4.x: Upgrade to >=[4.11.1](https://github.com/zitadel/zitadel/releases/tag/v4.11.1)

3.x: Update to >=[v4.11.1](https://github.com/zitadel/zitadel/releases/tag/v4.11.1) or check out workarounds

2.x: Update to >=[v4.11.1](https://github.com/zitadel/zitadel/releases/tag/v4.11.1) or check out workarounds

Workarounds

The recommended solution is to update Zitadel to a patched version.

If an upgrade is not possible, users can prevent actions from using unintended endpoints by setting network policies or firewall rules in your infrastructure. Note that this is outside of the functionality provided by ZITADEL.

Questions

If there are any questions or comments about this advisory, please send an email to [security@zitadel.com](mailto:[email protected])

Credits

This vulnerability was found by [zentrust partners GmbH](https://zentrust.partners) during a scheduled penetration test. Thank you to the analysts Martin Tschirsich, Joud Zakharia, Christopher Baumann.

The full report will be made public after the complete review.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: None.

Affected software

CVE-2026-27945 is recorded against 3 packages.

  • github.com/zitadel/zitadel
  • github.com/zitadel/zitadel/v2
  • zitadel (from 4.0.0 up to 4.11.1)

Timeline and source

Published on 10 March 2026 and last revised on 16 April 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com (Advisory)
nvd.nist.gov (Advisory)
github.com (Fix)
github.com (Web)

Other advisories for this package

github.com/zitadel/zitadel has other advisories on record. If you are patching this one, these are worth checking on the same host:

Details

Severity Medium
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-03-10
Updated 2026-08-20
Modified 2026-04-16

Affected Packages

Software From version Fixed in
github.com/zitadel/zitadel — —
github.com/zitadel/zitadel/v2 — —
zitadel 4.0.0 4.11.1

Similar Threats

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