---
id: "CVE-2026-87945"
kind: "vulnerability"
aliases: ["CVE-2026-87945"]
title: "Drupal SAML SSO Service Provider: open redirect enables fake data source"
severity: "medium"
cvss: 5.4
epss: 0.00172
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["drupal", "package", "saml", "self-hosted", "sso"]
not_affected_if: ["module-not-installed"]
published_at: "2026-10-22T02:17:04+00:00"
first_seen_at: "2026-10-23T21:57:30+00:00"
updated_at: "2026-10-25T04:14:29+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87945", "first_seen_at": "2026-10-23T21:57:30+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-87945", "first_seen_at": "2026-10-24T07:15:52+00:00"}]
---

# Drupal SAML SSO Service Provider: open redirect enables fake data source

The Drupal SAML SSO - Service Provider module redirects users to URLs an attacker can choose, so a crafted link can send a visitor to a malicious site. The advisory describes it as letting an attacker fake the source of data.

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

## How to check

- Check the installed version of the Drupal SAML SSO - Service Provider module with `drush pm:list --filter=saml` or the module list at /admin/modules.
- Treat any version up to and including `3.2.0` as affected, per the description.

## Fix

- Upgrade the SAML SSO - Service Provider module to a version newer than `3.2.0`. The fixed version is unknown from the sources.

## Timeline

- 2026-10-23T21:57:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-87945
- 2026-10-24T07:15:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-87945

## From the sources

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal SAML SSO - Service Provider  allows Fake the Source of Data. This issue affects SAML SSO - Service Provider  versions: from 0.0.0 to 3.2.0.

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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_