---
id: "CVE-2026-11753"
kind: "vulnerability"
aliases: ["CVE-2026-11753"]
title: "armeria-saml: unvalidated RelayState redirect after SAML login"
severity: "medium"
cvss: 5.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["armeria-saml", "java", "package", "saml", "sso"]
not_affected_if: ["no-relaystate-redirect", "not-using-armeria-saml"]
published_at: "2026-11-04T06:17:03+00:00"
first_seen_at: "2026-11-04T06:25:20+00:00"
updated_at: "2026-11-04T06:26:02+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11753", "first_seen_at": "2026-11-04T06:25:20+00:00"}]
---

# armeria-saml: unvalidated RelayState redirect after SAML login

armeria-saml copies the attacker-controlled RelayState parameter into the HTTP Location header after a successful SAML login. An attacker can therefore send a user to any URL they choose, which is an open redirect often used for phishing.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the armeria-saml version in the project's dependency file (for example `build.gradle` or `pom.xml`) and see whether it is below `1.41.1`.
- Search the code that handles the SAML response for uses of RelayState that feed a redirect without an allow-list check.

## Fix

- armeria-saml versions prior to `1.41.1` are affected; move to `1.41.1` or later.

## Timeline

- 2026-11-04T06:25:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-11753

## Documents

- [advisory] Vendor advisory: github.com https://github.com/line/armeria/security/advisories/GHSA-89cp-657f-wp7v
- [poc] asvorg/CVE-2026-117532-poc https://github.com/asvorg/CVE-2026-117532-poc

## From the sources

A vulnerability has been identified in armeria-saml versions prior to 1.41.1, where attacker-controlled RelayState is reflected into the HTTP Location header after successful authentication, allowing an unvalidated redirect to an attacker-controlled URL.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_