CVE-2026-104070: Spip Crayons Plugin

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

The Crayons plugin for SPIP before 3.5.0 contains a missing authorization vulnerability that allows unauthenticated attackers to modify arbitrary editable object fields by omitting the secu_ anti-forgery parameter in crayons_store.php, causing the authorization dispatcher to resolve an unconditionally-true handler instead of the proper modification check. Attackers can chain this flaw to write a malicious .html skeleton file, disclose sensitive configuration files containing the site secret, and forge a signed ajax context to execute the uploaded skeleton, achieving arbitrary PHP code execution as the web-server user.

Affected products

• Spip Spip Crayons Plugin: before 3.5.0 (fixed in 3.5.0)

Published 2026-10-06. Last modified 2026-10-09.