XSS in Spip
CVE-2026-26223
SPIP before 4.4.8 allows cross-site scripting (XSS) in the private area via malicious iframe tags. The application does not properly sandbox or escape iframe content in the back-office, allowing an attacker to inject and execute malicious scripts. The fix adds a sandbox attribute to iframe tags in the private area. 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: +0.002
Affected products
- Spip — versions 4.4.0
Weakness classification (CWE)
References
- blog.spip.net/Mise-a-jour-de-securite-sortie-de-SPIP-4-4-8.html (vendor-advisory, Release Notes, patch, Vendor Advisory)
- git.spip.net/spip/spip (Product, product)
- www.vulncheck.com/advisories/spip-cross-site-scripting-via-iframe-tags-in-priva… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-26223?
- CVE-2026-26223 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-2026-26223?
- Medium severity. CVSS v3 base score is 6.1 out of 10.