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PatchSiren cyber security CVE debrief

CVE-2026-77647 SPIP CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-20T23:16:28.647Z and has not been modified since then. CVE-2026-77647 is a critical vulnerability in SPIP, a content management system, that allows unauthenticated remote attackers to execute arbitrary code due to incorrect identification of <?php blocks and var_export's mishandling of certain cases, such as the presence of a '<' character. The vulnerability has a CVSS score of 9.8 and is considered critical. Affected systems require immediate attention, and administrators should apply patches or upgrades to prevent exploitation. Evidence is limited, and defenders should verify SPIP installations and monitor for suspicious activity.

Vendor
SPIP
Product
Unknown
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-20
Original CVE updated
2026-09-08
Advisory published
2026-08-20
Advisory updated
2026-09-08

Who should care

Administrators and users of SPIP installations, as well as security teams and incident responders, should be aware of this vulnerability and take necessary actions to mitigate it. This includes reviewing system logs for suspicious activity, applying patches or upgrades, and implementing compensating controls. The vulnerability's critical severity and potential for remote code execution make it a high priority for affected organizations.

Technical summary

CVE-2026-77647 is a critical vulnerability in SPIP, a content management system, that allows unauthenticated remote attackers to execute arbitrary code. The vulnerability is related to incorrect identification of <?php blocks and var_export's mishandling of certain cases, such as the presence of a '<' character. The vulnerability has a CVSS score of 9.8 and is considered critical. Affected systems require immediate attention, and administrators should apply patches or upgrades to prevent exploitation.

Defensive priority

Critical vulnerability in SPIP, a content management system, allowing unauthenticated remote code execution with a CVSS score of 9.8.

Recommended defensive actions

  • Apply the patch or upgrade to SPIP version 4.4.20 or later
  • Restrict access to the SPIP application
  • Monitor for suspicious activity
  • Perform a thorough inventory check of SPIP installations
  • Implement compensating controls, such as web application firewalls

Evidence notes

The CVE is based on information from official sources, including the NVD and CVE.org. However, some details about the vulnerability and affected products are not provided. The vulnerability allows unauthenticated remote attackers to execute arbitrary code due to incorrect identification of <?php blocks and var_export's mishandling of certain cases. Evidence is limited, and defenders should verify SPIP installations and monitor for suspicious activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77647 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77647

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-77647 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77647

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.