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

Q: What is CVE-2026-27473?

CVE-2026-27473 is a medium-severity cross-site scripting vulnerability in Spip Spip, published on 19 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Q: Is CVE-2026-27473 being exploited?

There is no known exploitation of CVE-2026-27473 in the wild and no public exploit code.

Medium 5.1 Published 19 Feb 2026 Updated 5 Mar 2026

Attackers can inject persistent scripts via syndication URLs, leading to code execution or account takeover when administrators view syndicated site details.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2026-27473?

CVE-2026-27473 is a medium-severity cross-site scripting vulnerability in Spip Spip, published on 19 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2026-27473?

It affects 1 product.

Products include Spip Spip.

How do I fix CVE-2026-27473?

Upgrade to a fixed version.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-27473 being exploited?

There is no known exploitation of CVE-2026-27473 in the wild and no public exploit code.

All Spip Spip vulnerabilities

Sources

Also known as DEBIAN-CVE-2026-27473, GHSA-fgj6-7f58-836m, UBUNTU-CVE-2026-27473.