RCE in Spip
CVE-2026-66738
SPIP before 4.4.18 contains a code injection vulnerability in SQLite-backed installations. The navigation menu endpoint improperly handles array-typed user input, which bypasses input sanitization and allows the value to break out of an internal quoted string context when evaluated as PHP. An authenticated attacker with at minimum editor (redacteur) privileges can submit a single crafted GET request to /ecrire/?exec=navigation to execute arbitrary OS commands in the web server process. MySQL-backed installations are not affected.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Spip — versions 0
Weakness classification (CWE)
References
- blog.spip.net/Mise-a-jour-critique-de-securite-sortie-de-SPIP-4-4-18.html (release-notes)
- www.vulncheck.com/advisories/spip-code-injection-via-navigation-endpoint-on-sql… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-66738?
- CVE-2026-66738 is a high-severity vulnerability in Spip, classified under Code Injection. CVSS score: 8.8/10. Published 2026-08-10.
- How severe is CVE-2026-66738?
- High severity. CVSS v3 base score is 8.8 out of 10.