Vulnerability · Published Sep 11, 2026 · Assigned by VulnCheck

CVE-2026-72709SPIP < 4.4.18 Missing Authorization via ecrire/action/

Critical 9.8

In plain English

A critical-severity missing authorization in SPIP from SPIP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.7%top 48.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

SPIP before version 4.4.18 contains a missing authorization vulnerability in sensitive actions under ecrire/action/ that allows unauthenticated attackers to invoke privileged actions by supplying only a valid CSRF nonce without any server-side permission check. Attackers can bypass template-level authorization guards through direct HTTP requests to invoke actions such as editer_auteur, enabling arbitrary account password rewrites including administrator accounts and resulting in full account takeover.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	spip	4.4.19+dfsg-0+deb13u1	DEBIAN-CVE-2026-72709
Debian:14	spip	4.4.18+dfsg-1	DEBIAN-CVE-2026-72709
Ubuntu:22.04:LTS	spip	no fix listed	UBUNTU-CVE-2026-72709
Ubuntu:24.04:LTS	spip	no fix listed	UBUNTU-CVE-2026-72709
Ubuntu:26.04:LTS	spip	no fix listed	UBUNTU-CVE-2026-72709

Affected products (as reported)

Vendor	Product	Versions
SPIP	SPIP	0 – before 4.4.18

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Researcher Blog technical-description, exploit
Release Notes release-notes, patch
https://www.vulncheck.com/advisories/spip-missing-authorization-via-ecrire-action-editer-auteur third-party-advisory