Vulnerability · Published Feb 19, 2026 · Assigned by VulnCheck
CVE-2026-27475SPIP < 4.4.9 Insecure Deserialization
High 8.1
In plain English
A high-severity security flaw in SPIP from SPIP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
SPIP before 4.4.9 allows Insecure Deserialization in the public area through the table_valeur filter and the DATA iterator, which accept serialized data. An attacker who can place malicious serialized content (a pre-condition requiring prior access or another vulnerability) can trigger arbitrary object instantiation and potentially achieve code execution. The use of serialized data in these components has been deprecated and will be removed in SPIP 5. This vulnerability is not mitigated by the SPIP security screen.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | spip | 4.4.11+dfsg-0+deb13u1 | DEBIAN-CVE-2026-27475 |
| Debian:13 | spip | 4.4.11+dfsg-0+deb13u1 | DSA-6155-1 |
| Debian:14 | spip | 4.4.9+dfsg-1 | DEBIAN-CVE-2026-27475 |
| Ubuntu:22.04:LTS | spip | no fix listed | UBUNTU-CVE-2026-27475 |
| Ubuntu:24.04:LTS | spip | no fix listed | UBUNTU-CVE-2026-27475 |
| Ubuntu:25.10 | spip | no fix listed | UBUNTU-CVE-2026-27475 |
| Ubuntu:26.04:LTS | spip | no fix listed | UBUNTU-CVE-2026-27475 |
Affected products (as reported)
References
- https://blog.spip.net/Mise-a-jour-de-securite-sortie-de-SPIP-4-4-9.html vendor-advisory, patch
- https://git.spip.net/spip/spip product
- VulnCheck Advisory: SPIP < 4.4.9 Insecure Deserialization third-party-advisory