CVE-2026-77806 json
SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026.
published 2026-08-21 2 mo ago modified 2026-10-15 24 d ago also EUVD-2026-63948
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.5%
- EPSS 4.5% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
- SPIP SPIP 4.4.21
- spip Debian 13 4.4.21+dfsg-0+deb13u1
- spip Debian 14 4.4.21+dfsg-1
debian advisories DEBIAN-CVE-2026-77806
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
4.48% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template SPIP < 4.4.22 - Unauthenticated RCE nuclei detection template
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- SPIP SPIP
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
References
- github.com /rapid7/metasploit-framework/pull/21790
- github.com /rapid7/metasploit-framework/pull/21790#issuecomment-5368038123
- github.com /rapid7/metasploit-framework/pull/21790/commits/b16eca819abb8f1401f21d115e71e3dfc67b847c
- blog.spip.net /Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-21.html
Sources
- CVE List CVE-2026-77806
- NVD CVE-2026-77806
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