---
id: "CVE-2026-87953"
kind: "vulnerability"
aliases: ["CVE-2026-87953"]
title: "Drupal SAML SSO Service Provider: server-side request forgery through versions 3.2.0"
severity: "low"
cvss: 3.3
epss: 0.00168
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["drupal", "package", "saml", "self-hosted"]
not_affected_if: ["module-not-installed", "patched-version"]
published_at: "2026-10-22T02:17:05+00:00"
first_seen_at: "2026-10-23T21:57:30+00:00"
updated_at: "2026-10-25T04:45:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87953", "first_seen_at": "2026-10-23T21:57:30+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-87953", "first_seen_at": "2026-10-24T07:15:52+00:00"}]
---

# Drupal SAML SSO Service Provider: server-side request forgery through versions 3.2.0

The Drupal SAML SSO - Service Provider module contains a server-side request forgery flaw affecting versions up to and including 3.2.0. An attacker can make the Drupal server send requests to internal or arbitrary URLs of the attacker's choosing.

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

## How to check

- Check the installed version of the `saml_sso` module (Drupal SAML SSO - Service Provider) with `drush pm:list --filter=saml` or `composer show drupal/saml_sso`
- Look for the module in `composer.lock` and confirm whether it is at `3.2.0` or earlier

## Fix

- Upgrade the Drupal SAML SSO - Service Provider module to a version later than `3.2.0`; the sources do not name the fixed version, so check the drupal.org project page
- If no fixed release is available, disable the module until it is patched

## Timeline

- 2026-10-23T21:57:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-87953
- 2026-10-24T07:15:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-87953

## From the sources

Server-Side Request Forgery (SSRF) vulnerability in Drupal SAML SSO - Service Provider  allows Server Side Request Forgery. 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_