---
id: CVE-2026-77647
title: >-
  SPIP before 4.4.20 allows unauthenticated remote attackers to execute
  arbitrary code, as exploited in the wild in August 2026
summary: >-
  SPIP before 4.4.20 allows unauthenticated remote attackers to execute
  arbitrary code, as exploited in the wild in August 2026. This is related to
  incorrect identification of <?php blocks, and var_export's mishandling of
  certain cases suc…
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: '2026-08-20'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:29:09.680'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77647'
references:
  - url: >-
      https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-20.html
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-security-announce/2026/msg00359.html'
    label: cve@mitre.org
tags:
  - nvd
  - in-the-wild
  - exploit-available
epss: 0.02499
epssPercentile: 0.84036
exploited: true
exploits:
  metasploit:
    - exploit/multi/http/spip_x_spip_filtre_rce
  checkedAt: '2026-09-26T09:06:00.716Z'
exploitAvailable: true
ingestedAt: '2026-09-08T20:10:03.157Z'
---

## Overview

SPIP before 4.4.20 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to incorrect identification of <?php blocks, and var_export's mishandling of certain cases such as presence of a '<' character.

## Remediation

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