CVE-2026-77806
9.8
CRITICAL · CVSS 3.1 · EPSS 4.5% (pctl 91)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 4.48% — more likely to be exploited than 91% of all CVEs |
| Weakness | CWE-94 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2026-08-21 |
| Last modified | 2026-09-08 |
References
- 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
- https://github.com/rapid7/metasploit-framework/pull/21790#issuecomment-5368038123
- https://github.com/rapid7/metasploit-framework/pull/21790/commits/b16eca819abb8f1401f21d115e71e3dfc67b847c
→ the Explorer · watch your stack · NVD