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.

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)

EPSS: 0.003 (17.6th percentile) — read the EPSS interpretation.

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.

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-2026-27473?: 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.