EUVD-2026-63757
GHSA-wj6g-rh9q-6vvm
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network-reachable code injection with no user interaction (AV:N/AC:L/PR:N/UI:N); arbitrary PHP execution yields full C/I/A compromise of the host application.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
SPIP before 4.4.20 allows unauthenticated remote attackers to execute arbitrary code, as exploited in the wild in August 2026. This is related to incorrect identification of <?php blocks, and var_export's mishandling of certain cases such as presence of a '<' character.
AnalysisAI
Remote code execution in SPIP before 4.4.20 allows unauthenticated attackers to run arbitrary PHP on the server by exploiting flawed detection of <?php blocks combined with var_export's mishandling of input containing a '<' character. The CVE description itself reports exploitation in the wild during August 2026, and the flaw is network-reachable with no authentication or user interaction (CVSS 9.8). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions - remote unauthenticated exploitation against default configurations of SPIP prior to 4.4.20 (AV:N/AC:L/PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | All signals point to top-tier priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker sends a crafted HTTP request whose input contains a '<' character to a public SPIP instance running a version below 4.4.20. SPIP serializes that input via var_export into a cached PHP file, mis-parses the resulting `<?php`-like sequence, and executes the attacker's payload as PHP when the file is included - yielding remote code execution as the web server user. … |
| Remediation | Vendor-released patch: SPIP 4.4.20 - upgrade to 4.4.20 or later immediately, per the vendor advisory at https://blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-20.html; Debian-based systems should apply the packaged update referenced in https://lists.debian.org/debian-security-announce/2026/msg00359.html. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: create a complete inventory of SPIP deployments, identify systems running versions prior to 4.4.20, and prepare maintenance windows with full system backups. …
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External POC / Exploit Code
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