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.

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)

EPSS: 0.002 (6.7th percentile) — read the EPSS interpretation.

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.

Affected products

Spip — versions 4.4.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (vendor-advisory, Release Notes, patch, Vendor Advisory)
disclosure@vulncheck.com (Product, product)
disclosure@vulncheck.com (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.