CVE-2026-66738

High

Description

SPIP before 4.4.18 contains a code injection vulnerability in SQLite-backed installations. The navigation menu endpoint improperly handles array-typed user input, which bypasses input sanitization and allows the value to break out of an internal quoted string context when evaluated as PHP. An authenticated attacker with at minimum editor (redacteur) privileges can submit a single crafted GET request to /ecrire/?exec=navigation to execute arbitrary OS commands in the web server process. MySQL-backed installations are not affected.

SeverityHigh

CVSS8.8

Exploit probability—

Product

SPIP

PublishedAug 10, 2026

First seenAug 10, 2026

Weakness typeCWE-94Code injection

How to fix

Update

SPIP SPIP4.4.18 or later

Vendor advisories

blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-18.html

Affected products

Product	Affected versions	Fixed in
SPIP SPIP	v < 4.4.18	4.4.18

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