PatchSiren cyber security CVE debrief
CVE-2026-77806 SPIP CVE debrief
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-21T14:16:53.903Z and has not been modified since then. CVE-2026-77806 is a critical vulnerability in SPIP, a content management system, that allows unauthenticated remote attackers to execute arbitrary code via an X-Spip-Filtre HTTP request header. This issue was exploited in the wild in August 2026 and is related to code injection mishandled by analyse_resultat_skel. The vulnerability has a CVSS score of 9.8 and is considered critical. Evidence is based on official CVE and NVD records, as well as references from SPIP's security update blog post and Metasploit framework pull requests. SPIP users and administrators should review and apply the official patch to upgrade to version 4.4.21 or later.
- Vendor
- SPIP
- Product
- Unknown
- CVSS
- CRITICAL 9.8
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-08-21
- Original CVE updated
- 2026-08-21
- Advisory published
- 2026-08-21
- Advisory updated
- 2026-08-21
Who should care
SPIP users and administrators, web application security teams, and cybersecurity professionals responsible for vulnerability management and patching. They should apply the official patch to upgrade SPIP to version 4.4.21 or later, implement web application firewalls to detect and block suspicious X-Spip-Filtre HTTP request headers, monitor SPIP installations for signs of exploitation, restrict access to SPIP's administrative interface, and regularly review and update SPIP to ensure the latest security patches are applied.
Technical summary
CVE-2026-77806 is a critical vulnerability in SPIP, a content management system, that allows unauthenticated remote attackers to execute arbitrary code. The vulnerability is related to code injection via an X-Spip-Filtre HTTP request header that is mishandled by analyse_resultat_skel. This issue was exploited in the wild in August 2026. The vulnerability has a CVSS score of 9.8 and is considered critical.
Defensive priority
Critical vulnerability in SPIP, a content management system, allowing unauthenticated remote code execution.
Recommended defensive actions
- Apply the official patch to upgrade SPIP to version 4.4.21 or later.
- Implement web application firewalls to detect and block suspicious X-Spip-Filtre HTTP request headers.
- Monitor SPIP installations for signs of exploitation.
- Restrict access to SPIP's administrative interface.
- Regularly review and update SPIP to ensure the latest security patches are applied.
Evidence notes
The CVE-2026-77806 vulnerability in SPIP allows unauthenticated remote attackers to execute arbitrary code via an X-Spip-Filtre HTTP request header. This issue was exploited in the wild in August 2026 and is related to code injection mishandled by analyse_resultat_skel. Evidence is based on official CVE and NVD records, as well as references from SPIP's security update blog post and Metasploit framework pull requests.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-21T14:16:53.903Z and has not been modified since then.