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CVE-2026-72708 – Unauthenticated Blind SQL Injection – SPIP before 4.4.18

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Summary

CVE-2026-72708 is an unauthenticated blind SQL injection vulnerability in SPIP, a widely used open-source French CMS, affecting all versions before 4.4.18. The flaw resides in the MySQL escaping logic used by SPIP’s public sitemap generation feature and allows a remote, unauthenticated attacker to extract arbitrary database content. It carries a CVSS v4.0 base score of 8.7 (High).

Technical details

  • Root cause: the MySQL escaper function spip_mysql_cite() in ecrire/req/mysql.php fails to escape a supplied value when the target column is a date-type column and the value matches the pattern of a word character immediately followed by an opening parenthesis. This causes the value to be embedded unescaped into the generated SQL query instead of being treated as a literal.
  • Trigger conditions: the vulnerable code path is reached through the public sitemap template squelettes-dist/sitemap.xml.html, which passes the annee (year) parameter into a date-column query without proper authentication or additional validation.
  • Attack vector: network-based and unauthenticated — an attacker can send a crafted annee value (e.g., a time-based SQL payload) to the public sitemap endpoint of any exposed SPIP site.
  • Impact: successful exploitation enables time-based and boolean-based blind SQL injection, allowing an attacker to enumerate arbitrary database content. This includes exposure of the alea_ephemere secret, which SPIP uses to sign action nonces — potentially enabling further attacks such as CSRF-token/nonce forgery once the secret is recovered.

Affected software

  • SPIP versions prior to 4.4.18 (all versions before 4.4.18 are affected).

Severity

  • CVSS v4.0 Base Score: 8.7 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  • CVSS v3.1 Base Score: 7.5 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: upgrade SPIP to version 4.4.18 or later, where the escaping logic has been fixed.
  • If immediate patching is not possible: restrict or disable public access to the sitemap endpoint (sitemap.xml.html) at the web server or WAF layer, and monitor for anomalous requests containing SQL injection patterns targeting the annee parameter. These are interim measures only — upgrading remains the definitive fix.

References

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