XSS in Spip
CVE-2026-27473
SPIP before 4.4.9 allows Stored Cross-Site Scripting (XSS) via syndicated sites in the private area. The #URL_SYNDIC output is not properly sanitized on the private syndicated site page, allowing an attacker who can set a malicious syndication URL to inject persistent scripts that execute when other administrators view the syndicated site details.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · 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-stored-cross-site-scripting-via-syndicated-si… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-27473?
- CVE-2026-27473 is a medium-severity vulnerability in Spip, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-02-19.
- How severe is CVE-2026-27473?
- Medium severity. CVSS v3 base score is 6.4 out of 10.