CVE-2026-77806: SPIP before 4.4.21 allows unauthenticated remote attackers

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.

• EPSS 1.3% (67.5% percentile)
• CVSS 9.8 critical

Related briefings

• Attackers exploit SPIP sites through a single HTTP header 2026-08-26

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Read the full analysis on IntelFusions