Arbitrary Code Injection Affecting spip package, versions <4.4.21+dfsg-0+deb13u1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-DEBIAN13-SPIP-19220715
- published23 Aug 2026
- disclosed21 Aug 2026
Introduced: 21 Aug 2026
NewCVE-2026-77806 (opens in a new tab)How to fix?
Upgrade Debian:13 spip to version 4.4.21+dfsg-0+deb13u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream spip package and not the spip package as distributed by Debian.
See How to fix? for Debian:13 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-77806
- 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
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-77806.yaml