---
id: CVE-2026-87947
title: >-
  SAML SSO - Service Provider  - Moderately critical - Authentication bypass -
  SA-CONTRIB-2026-145
summary: >-
  Improper Verification of Cryptographic Signature vulnerability in Drupal SAML
  SSO - Service Provider  allows Signature Spoof. This issue affects SAML SSO -
  Service Provider  versions: from 0.0.0 to 3.2.0.
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'
cvssSource: adp
cwe:
  - CWE-347
vendor: Drupal
product: SAML SSO - Service Provider
affected:
  - saml_sso_-_service_provider >= 0.0.0 < 3.2.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-22T16:38:04.607263Z'
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T16:38:08.451Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-87947'
references:
  - url: 'https://www.drupal.org/sa-contrib-2026-145'
tags:
  - cve.org
ingestedAt: '2026-10-22T02:23:25.198Z'
epss: 0.00141
epssPercentile: 0.03407
---

## Overview

Improper Verification of Cryptographic Signature vulnerability in Drupal SAML SSO - Service Provider  allows Signature Spoof. This issue affects SAML SSO - Service Provider  versions: from 0.0.0 to 3.2.0.

## Affected

- `saml_sso_-_service_provider >= 0.0.0 < 3.2.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.