What’s Vulnerable › Vulnerabilities

CVE-2026-104070: SPIP Crayons Plugin < 3.5.0 Authorization Bypass RCE

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-09
• Weakness: CWE-862

Description

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 Crayons Plugin: before 3.5.0 — fixed in 3.5.0

How to fix

Upgrade to a fixed version: SPIP Crayons Plugin 3.5.0. Check the vendor advisory for mitigations.

References

• https://blog.spip.net/Mises-a-jour-de-securite-critique-plugins-Crayons-et-Simplog.html?lang=fr
• https://plugins.spip.net/crayons.html?lang=fr
• https://www.vulncheck.com/advisories/spip-crayons-plugin-authorization-bypass-rce

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