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CVE-2026-46670 – Unauthenticated SQL Injection – YesWiki < 4.6.4

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Summary

CVE-2026-46670 is a critical, unauthenticated SQL injection vulnerability affecting YesWiki, an open-source wiki platform. The flaw resides in the Bazar form-import functionality (FormManager::create()) and allows any unauthenticated visitor to a default YesWiki install to inject arbitrary SQL and extract the entire database, including user password hashes. The vulnerability carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: FormManager::create() performs unquoted concatenation of the bn_id_nature parameter directly into an SQL INSERT VALUES statement without sanitization.
  • Trigger condition: An attacker submits a crafted Bazar form-import request containing SQL expressions (e.g., using ASCII/SUBSTRING/HEX(VERSION())) in place of the expected numeric value.
  • Attack vector: The injected SQL expression is evaluated by the database before being stored, and the resulting inserted ID value leaks query results as numeric data, enabling character-by-character data extraction (a form of error/inference-based blind SQLi).
  • Access requirements: No authentication and no user interaction are required; the vulnerable functionality is reachable by any unauthenticated visitor on a default installation.
  • Impact: Full compromise of the underlying database, including exposure of the yeswiki_users table (usernames, emails, and password hashes), enabling downstream account takeover and further compromise.

Affected software

  • YesWiki versions prior to 4.6.4, including confirmed vulnerable releases 4.6.1 and 4.6.2 (and the corresponding development branch commit).

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade YesWiki to version 4.6.4 or later, which patches the vulnerable SQL construction in FormManager::create().
  • If immediate patching is not possible: Restrict or disable public access to the Bazar form-import functionality, place a web application firewall in front of the instance to filter anomalous numeric/SQL-expression input in form submissions, and monitor database logs for suspicious query patterns.
  • Following the upgrade, rotate credentials for all YesWiki user accounts, particularly administrative accounts, as password hashes may have already been exposed.

References

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