CVE-2026-27473: SPIP < 4.4.9 Stored Cross-Site Scripting via Syndicated Sites

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-19 · updated 2026-06-17
Weakness: CWE-79

Description

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.

Affected products

SPIP: from 4.4.0 before 4.4.9 — fixed in 4.4.9

How to fix

Upgrade to a fixed version: SPIP 4.4.9. Check the vendor advisory for mitigations.

References

https://blog.spip.net/Mise-a-jour-de-securite-sortie-de-SPIP-4-4-9.html
https://git.spip.net/spip/spip
https://www.vulncheck.com/advisories/spip-stored-cross-site-scripting-via-syndicated-sites

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