---
title: "CVE-2026-57210: Heimdall - Broken Access Control"
description: "Heimdall < 0.17.17 contains an input validation vulnerability caused by improper validation of client IP addresses extracted from Forwarded and X-Forwarded-For headers, letting attackers inject arbitrary or malformed IP strings, exploit requires trusted_proxies configuration."
url: https://panop.io/threat-heartbeat/CVE-2026-57210/
---

# CVE-2026-57210 Heimdall - Broken Access Control

Heimdall < 0.17.17 contains an input validation vulnerability caused by improper validation of client IP addresses extracted from Forwarded and X-Forwarded-For headers, letting attackers inject arbitrary or malformed IP strings, exploit requires trusted\_proxies configuration.

CVSS base score 7.0 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.42% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-57210)

## Details

Type

Broken Access Control

Impact

Broken Access Control

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-20](https://cwe.mitre.org/data/definitions/20.html)

## Vendor fix

Update to version 0.17.17 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-57210](https://nvd.nist.gov/vuln/detail/CVE-2026-57210)
- [https://github.com/dadrus/heimdall/releases/tag/v0.17.17](https://github.com/dadrus/heimdall/releases/tag/v0.17.17)
- [https://github.com/dadrus/heimdall/security/advisories/GHSA-38x9-25wx-7fg2](https://github.com/dadrus/heimdall/security/advisories/GHSA-38x9-25wx-7fg2)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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