XSS in Spip

CVE-2026-26345

SPIP before 4.4.8 contains a stored cross-site scripting (XSS) vulnerability in the public area triggered in certain edge-case usage patterns. The echapper_html_suspect() function does not adequately sanitize user-controlled content, allowing authenticated users with content-editing privileges (e.g., author-level roles and above) to inject malicious scripts. The injected payload may be rendered across multiple pages within the framework and execute in the browser context of other users, including administrators. Successful exploitation can allow attackers to perform actions in the security context of the victim user, including unauthorized modification of application state. This vulnerability is not mitigated by the SPIP security screen.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (6.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

  • Spip — versions 4.4.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-26345?
CVE-2026-26345 is a medium-severity vulnerability in Spip, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-02-19.
How severe is CVE-2026-26345?
Medium severity. CVSS v3 base score is 5.4 out of 10.