CVE-2026-77806
85Vexday Risk Score
Patch now. It exploitation observed by VulnCheck and has a working public exploit.
ssvc Actcvss 9.8epss 4.2%
from disclosure to weapon3 days
Published on NVDAug 21
1st PoC+3d
VulnCheckAug 21
exploitation probability
4.2%top 10% of all CVEs
observed exploitation
yesVulnCheck
2 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
SPIP · SPIPpublic PoCs found — 2
githubgithub.com/CuteeCat/CVE-2026-77806★ 2vulncheckvulncheck.com/xdb/2816147a081dunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-21.htmlhttps://github.com/rapid7/metasploit-framework/pull/21790https://github.com/rapid7/metasploit-framework/pull/21790/commits/b16eca819abb8f1401f21d115e71e3dfc67b847chttps://github.com/rapid7/metasploit-framework/pull/21790#issuecomment-5368038123