Denied Host Validation Bypass in Zitadel Actions

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.9 · CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N

EPSS

• CVE-2024-49753: 0.65% estimated exploitation activity in the next 30 days; percentile 51.31 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A flaw in the URL validation mechanism of Zitadel actions allows bypassing restrictions intended to block requests to localhost (127.0.0.1). The isHostBlocked check, designed to prevent such requests, can be circumvented by creating a DNS record that resolves to 127.0.0.1. This enables actions to send requests to localhost despite the intended security measures. Details While attempting to send a request directly to 127.0.0.1 via an action results in an error (see image below), the restriction can be bypassed using a custom DNS record. <img width="781" alt="image" src="https://github.com/user-attachments/assets/6d22dae8-407f-4420-a937-aca53d22d05d" The relevant action code demonstrates the attempted request to 127.0.0.1: By creating a DNS record that resolves a custom domain to 127.0.0.1 (illustrated below using messwithdns), the action can successfully send the request. The modified action code uses the custom domain instead of 127.0.0.1: This demonstrates that data from the…

Published by the source

25 Oct 2024, 19:29 UTC

Last modified by the source

9 Jul 2025, 15:24 UTC

Source last checked

26 Oct 2026, 15:09 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-6cf5-w9h3-4rqv

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2024-49753

Advisory: Denied Host Validation Bypass in Zitadel Actions
IDs: CVE-2024-49753, GHSA-6cf5-w9h3-4rqv
Record: https://patchnext.com/advisories/cve-2024-49753 (revision 1, source checked 26 Oct 2026, 15:09 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/zitadel/zitadel 2.64.1, 2.63.6, 2.62.8, 2.61.4, 2.60.4, 2.59.5, 2.58.7, 1.80.0-v2.20.0.20241022141644-79fb4cc1cc6e, 0.0.0-20241022141644-79fb4cc1cc6e. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/zitadel/zitadel: affected >= 2.64.0, <= 2.64.0; >= 2.63.0, < 2.63.6; >= 2.62.0, < 2.62.8; >= 2.61.0, < 2.61.4; >= 2.60.0, < 2.60.4; >= 2.59.0, < 2.59.5; < 0.0.0-20241022141644-79fb4cc1cc6e; >= 1.80.1, < 2.58.7; < 1.80.0-v2.20.0.20241022141644-79fb4cc1cc6e; fixed in 2.60.4, 0.0.0-20241022141644-79fb4cc1cc6e, 1.80.0-v2.20.0.20241022141644-79fb4cc1cc6e, 2.64.1, 2.62.8, 2.58.7, 2.59.5, 2.63.6, 2.61.4

## Suggested inspection (read-only)
- Go github.com/zitadel/zitadel: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/zitadel/zitadel.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-6cf5-w9h3-4rqv (GitHub-reviewed advisory GHSA-6cf5-w9h3-4rqv lists affected ranges: Go github.com/zitadel/zitadel >=2.64.0 =2.63.0 =2.62.0 =2.61.0 =2.60.0 =2.59.0 =0 =1.80.1 =0.0.0 <1.80.0-v2.20.0.20241022141644-79fb4cc1cc6e)

Commands are suggestions: review each one before running it.