SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to code injection via an X-Spip-Filtre HTTP request header that is mishandled by analyse_resultat_skel.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-21.ht…
cve@mitre.org
https://github.com/rapid7/metasploit-framework/pull/21790
cve@mitre.org
https://github.com/rapid7/metasploit-framework/pull/21790#issuecomment-53680381…
cve@mitre.org
https://github.com/rapid7/metasploit-framework/pull/21790/commits/b16eca819abb8…
cve@mitre.org