What is CVE-2026-77806?
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.
The record classifies CVE-2026-77806 under weakness class CWE-94. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 45 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 4.2% probability of exploitation in the next 30 days, higher than 90.2% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-08-21
Is CVE-2026-77806 being exploited?
Weaponised exploit code for CVE-2026-77806 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2026/CVE-2026-77806.yaml).
- CuteeCat/CVE-2026-77806 (github)
Affected products and versions
- SPIP: SPIP
How to fix CVE-2026-77806
No vendor patch reference has been recorded for CVE-2026-77806 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-77806
1 tracked threat in the Threadlinqs corpus references CVE-2026-77806, either in the campaign’s CVE list or as an indicator on the campaign record.
- Pre-Authentication Remote Code Execution in SPIP CMS (CVE-2026-77806) — Actively Exploited — CRITICAL · 2026-08-29
Sources
Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.