# CVE-2026-72709

## Summary

- **CVE ID:** CVE-2026-72709
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-862
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 15, 2026

## Description

SPIP before 4.4.18 contains a missing authorization vulnerability in the administrative action endpoints under ecrire/action/ that allows unauthenticated attackers to perform privileged actions by supplying a valid HMAC-SHA256 nonce without any server-side permission check via autoriser(). Attackers can obtain a valid nonce, compute it for any action as the anonymous user, and invoke the editer_auteur action directly over HTTP to reset the password of any user account, including the administrator.

## Affected Products

- SPIP — SPIP (0)

## References

- [CNA](https://blog.lexfo.fr/casse-spip-sqli-to-rce.html)
- [CNA](https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-18.html)
- [CNA](https://www.vulncheck.com/advisories/spip-missing-authorization-via-ecrire-action-editer-auteur)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 30.0

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._