XSS in Spip
CVE-2026-27474
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (26.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001
Affected products
- Spip — versions 4.4.0
Weakness classification (CWE)
References
- blog.spip.net/Mise-a-jour-de-securite-sortie-de-SPIP-4-4-9.html (vendor-advisory, Release Notes, patch, Vendor Advisory)
- git.spip.net/spip/spip (Product, product)
- www.vulncheck.com/advisories/spip-cross-site-scripting-in-private-area-incomple… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-27474?
- CVE-2026-27474 is a medium-severity vulnerability in Spip, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-02-19.
- How severe is CVE-2026-27474?
- Medium severity. CVSS v3 base score is 6.1 out of 10.