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CVE-2026-104462 – SQL Injection – YesWiki before 4.6.7

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Summary

CVE-2026-104462 is a SQL injection vulnerability in YesWiki, an open-source wiki engine, affecting versions before 4.6.7. The flaw resides in the Bazar nuagetag action, which concatenates an unescaped tags parameter directly into a raw SQL IN clause, allowing an attacker to inject arbitrary SQL and exfiltrate database contents including user password hashes. The issue carries a CVSS v3.1 base score of 7.5 (High) and a CVSS v4.0 base score of 8.8 (High).

Technical details

  • Root cause: The nuagetag action in the Bazar module builds a SQL IN (...) clause by directly concatenating the tags parameter without escaping or parameterization.
  • Trigger conditions: An attacker supplies a crafted tags value ending in a backslash, which flips MySQL’s quote parity (exploiting MySQL’s default backslash-escape behavior) and allows a UNION-based subquery to be appended to the original query.
  • Attack vector: Network-based and does not require authentication on default installations, since many YesWiki installs ship with a default write ACL of *, letting unauthenticated or low-privileged users submit page content containing the malicious nuagetag tag.
  • Impact: Successful exploitation allows extraction of arbitrary database table data, including the yeswiki_users table and its stored password hashes, resulting in a confidentiality breach without requiring any user interaction.

Affected software

  • YesWiki (Composer package yeswiki/yeswiki) versions prior to 4.6.7
  • Fixed in version 4.6.7 and later

Severity

  • 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
  • CVSS v4.0 Base Score: 8.8 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
  • CWE-89: Improper Neutralization of Special Elements used in an SQL Command (‘SQL Injection’)

Mitigation and recommended actions

  • Immediate: Upgrade YesWiki to version 4.6.7 or later, where the nuagetag action’s SQL query construction has been fixed.
  • If immediate patching is not possible:
    • Restrict the default write ACL (avoid default_write_acl => '*') so that only trusted, authenticated users can create or edit pages that include Bazar nuagetag tags.
    • Disable or restrict access to the Bazar nuagetag action/module if it is not required.
    • Monitor web application logs for unusual tags parameter values containing backslashes, UNION, or SQL comment sequences submitted to the nuagetag action.
    • Deploy a web application firewall rule to block SQL injection patterns targeting the nuagetag parameter as a temporary compensating control.

References

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