---
id: "CVE-2026-87952"
kind: "vulnerability"
aliases: ["CVE-2026-87952"]
title: "Drupal SAML SSO Service Provider: capture-replay lets stolen logins authenticate"
severity: "low"
cvss: 3.1
epss: 0.00219
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["drupal", "package", "saml", "sso"]
not_affected_if: ["no-saml-sso-module"]
published_at: "2026-10-22T02:17:04+00:00"
first_seen_at: "2026-10-23T21:57:30+00:00"
updated_at: "2026-10-25T04:47:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87952", "first_seen_at": "2026-10-23T21:57:30+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-87952", "first_seen_at": "2026-10-24T07:15:52+00:00"}]
---

# Drupal SAML SSO Service Provider: capture-replay lets stolen logins authenticate

The Drupal SAML SSO - Service Provider module has a capture-replay authentication bypass affecting versions up to and including 3.2.0. An attacker who has captured valid SAML authentication messages can replay them to log in to remote services.

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

## Timeline

- 2026-10-23T21:57:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-87952
- 2026-10-24T07:15:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-87952

## From the sources

Authentication Bypass by Capture-replay vulnerability in Drupal SAML SSO - Service Provider  allows Remote Services with Stolen Credentials. 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_