Vulnerability · Published Aug 21, 2026 · Assigned by mitre
CVE-2026-77806
Critical 9.8
In plain English
A critical-severity code injection 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 4.5% (higher than 92% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | spip | 4.4.21+dfsg-0+deb13u1 | DEBIAN-CVE-2026-77806 |
| Debian:14 | spip | 4.4.21+dfsg-1 | DEBIAN-CVE-2026-77806 |
| Ubuntu:22.04:LTS | spip | no fix listed | UBUNTU-CVE-2026-77806 |
| Ubuntu:24.04:LTS | spip | no fix listed | UBUNTU-CVE-2026-77806 |
| Ubuntu:26.04:LTS | spip | no fix listed | UBUNTU-CVE-2026-77806 |
Affected products (as reported)
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/rapid7/metasploit-framework/pull/21790
- https://github.com/rapid7/metasploit-framework/pull/21790#issuecomment-5368038123
- https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-21.html
- https://github.com/rapid7/metasploit-framework/pull/21790/commits/b16eca819abb8f1401f21d115e71e3dfc67b847c