CVE-2026-77806: critical vulnerability in SPIP
Published
85Vexday Risk Score
Patch now. It exploitation observed by VulnCheck and has a working public exploit.
ssvc Actcvss 9.8epss 4.5%
from disclosure to weapon3 days
Published on NVDAug 21
1st PoC+3d
VulnCheckAug 21
exploitation probability
4.5%top 9% 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.
Related CVEs — SPIP
In the same product, most dangerous first.
CVE-2024-8517CRITICALSPIP Bigup Multipart File Upload OS Command InjectionEPSS 94.6%CVE-2024-7954CRITICALSPIP porte_plume Plugin Arbitrary PHP ExecutionEPSS 90.1%CVE-2026-77647CRITICALCVE-2026-77647EPSS 2.3%CVE-2026-72710CRITICALSPIP < 4.4.18 RCE via editer_objet.php Job Queue InjectionEPSS 1.1%CVE-2026-27475CRITICALSPIP < 4.4.9 Insecure DeserializationEPSS 0.9%CVE-2026-8429HIGHSPIP < 4.4.14 Remote Code Execution via Private SpaceEPSS 0.9%
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