CVE-2026-77806

SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as...

9.8 CriticalPublic exploitFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

4.48%Up 3.7 points since Aug 22, 2026

What each source reports

CVE List Score used 9.8

Record: CVE-2026-77806
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-94
Updated: 2026-11-02

EUVDEUVD-2026-63948 9.8

Record: EUVD-2026-63948
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-vgr8-rqwx-wqrp 9.8

SPIP before 4.4.21 allows unauthenticated remote attackers to execute arbitrary code, as...

Record: GHSA-vgr8-rqwx-wqrp
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-94
Updated: 2026-11-02

NVD 9.8

Record: CVE-2026-77806
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-94
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-77806 9.8

Record: DEBIAN-CVE-2026-77806
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-77806 9.8

Record: UBUNTU-CVE-2026-77806
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

spip

Affected packages

Affected packages
Package	Affected	Fixed
`spip` Debian:13	before 4.4.21+dfsg-0+deb13u1, plus listed versions 4.4.10+dfsg-14.4.11+dfsg-0+deb13u14.4.11+dfsg-14.4.13+dfsg-0+deb13u14.4.13+dfsg-1 Show 18 moreShow less 4.4.14+dfsg-14.4.15+dfsg-0+deb13u14.4.15+dfsg-14.4.16+dfsg-0+deb13u14.4.16+dfsg-14.4.18+dfsg-14.4.19+dfsg-0+deb13u14.4.19+dfsg-14.4.20+dfsg-0+deb13u14.4.20+dfsg-14.4.3+dfsg-14.4.3+dfsg-1+deb13u14.4.4+dfsg-14.4.5+dfsg-14.4.6+dfsg-14.4.7+dfsg-14.4.8+dfsg-14.4.9+dfsg-1	4.4.21+dfsg-0+deb13u1
`spip` Debian:14	before 4.4.21+dfsg-1, plus listed versions 4.4.10+dfsg-14.4.11+dfsg-14.4.13+dfsg-14.4.14+dfsg-14.4.15+dfsg-1 Show 11 moreShow less 4.4.16+dfsg-14.4.18+dfsg-14.4.19+dfsg-14.4.20+dfsg-14.4.3+dfsg-14.4.4+dfsg-14.4.5+dfsg-14.4.6+dfsg-14.4.7+dfsg-14.4.8+dfsg-14.4.9+dfsg-1	4.4.21+dfsg-1
`spip` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 3.0.20-13.0.21-13.0.21-1ubuntu13.0.21-1ubuntu1+esm1	None known
`spip` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 3.1.4-33.1.4-4~deb9u3build0.18.04.13.1.4-4~deb9u5build0.18.04.13.1.4-4~deb9u5ubuntu0.1~esm2	None known
`spip` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 3.2.4-13.2.5-13.2.7-13.2.7-1ubuntu0.13.2.7-1ubuntu0.1+esm2	None known
`spip` Ubuntu:22.04:LTS	All versions, plus listed versions 3.2.11-33.2.12-14.0.2-14.0.4-1	None known
`spip` Ubuntu:24.04:LTS	All versions, plus listed versions 4.1.11+dfsg-14.1.12+dfsg-14.1.13+dfsg-14.1.15+dfsg-14.2.9+dfsg-2	None known
`spip` Ubuntu:26.04:LTS	All versions, plus listed versions 4.4.3+dfsg-14.4.6+dfsg-14.4.7+dfsg-14.4.8+dfsg-14.4.9+dfsg-1	None known

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Nuclei	SPIP < 4.4.22 - Unauthenticated RCE
PoC in GitHub	CuteeCat/CVE-2026-77806	2026-08-24

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, Nuclei, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-77806 is a critical vulnerability (CVSS 9.8) in Spip, published August 21, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 4.48%, the 91st percentile. Fixed in spip 4.4.21+dfsg-0+deb13u1.