---
id: CVE-2026-77806
title: >-
  SPIP before 4.4.21 allows unauthenticated remote attackers to execute
  arbitrary code, as exploited in the wild in August 2026
summary: >-
  SPIP before 4.4.21 allows unauthenticated remote attackers to execute
  arbitrary code, as exploited in the wild in August 2026. This is related to
  code injection via an X-Spip-Filtre HTTP request header that is mishandled by
  analyse_resul…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
published: '2026-08-21'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:29:09.680'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77806'
references:
  - url: >-
      https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-21.html
    label: cve@mitre.org
  - url: 'https://github.com/rapid7/metasploit-framework/pull/21790'
    label: cve@mitre.org
  - url: >-
      https://github.com/rapid7/metasploit-framework/pull/21790#issuecomment-5368038123
    label: cve@mitre.org
  - url: >-
      https://github.com/rapid7/metasploit-framework/pull/21790/commits/b16eca819abb8f1401f21d115e71e3dfc67b847c
    label: cve@mitre.org
tags:
  - nvd
  - in-the-wild
  - exploit-available
epss: 0.04479
epssPercentile: 0.9112
exploited: true
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/CuteeCat/CVE-2026-77806'
  nuclei:
    - CVE-2026-77806
  checkedAt: '2026-09-27T10:34:00.543Z'
exploitAvailable: true
ingestedAt: '2026-09-08T20:10:03.158Z'
---

## Overview

SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to code injection via an X-Spip-Filtre HTTP request header that is mishandled by analyse_resultat_skel.

## Remediation

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