CVE-2026-27474: SPIP < 4.4.9 Cross-Site Scripting in Private Area (Incomplete Fix)

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-19 · updated 2026-06-17
Weakness: CWE-79

Description

SPIP before 4.4.9 allows Cross-Site Scripting (XSS) in the private area, complementing an incomplete fix from SPIP 4.4.8. The echappe_anti_xss() function was not systematically applied to input, form, button, and anchor (a) HTML tags, allowing an attacker to inject malicious scripts through these elements. This vulnerability is not mitigated by the SPIP security screen.

Affected products

SPIP: from 4.4.0 before 4.4.9 — fixed in 4.4.9

How to fix

Upgrade to a fixed version: SPIP 4.4.9. Check the vendor advisory for mitigations.

References

https://blog.spip.net/Mise-a-jour-de-securite-sortie-de-SPIP-4-4-9.html
https://git.spip.net/spip/spip
https://www.vulncheck.com/advisories/spip-cross-site-scripting-in-private-area-incomplete-fix

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