CVE-2026-77806

Unauthenticated Remote Code Execution via Malformed X‑Spip‑Filtre Header in SPIP

Published Aug 21, 2026 CVSS 3.1 · 9.8 Critical EPSS 4.5% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Unauthenticated Remote Code Execution via Malformed X‑Spip‑Filtre Header in SPIP
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
First Time appeared Spip
Spip spip
Weaknesses CWE-94
CPEs cpe:2.3:a:spip:spip:*:*:*:*:*:*:*:*
Vendors & Products Spip
Spip spip
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Aug 21, 2026, 5:43 PM
Reserved
Aug 21, 2026, 1:37 PM
Status
Deferred
Published
Aug 21, 2026, 2:16 PM
Modified
Oct 15, 2026, 7:10 PM