CVE-2026-104456
Deferred Deferred - Pending Action

Second-Order SQL Injection in YesWiki

Publication date: 2026-10-02

Last updated on: 2026-10-02

Assigner: VulnCheck

Description
YesWiki before 4.6.7 contains a second-order SQL injection vulnerability in AclService::updateRequestWithACL, where a stored username is concatenated unescaped into a read-ACL LIKE clause. Attackers can self-register an account name containing a double-quote payload, then load non-admin ACL-filtered listings to read database contents and bypass read ACLs.

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Meta Information

Published
2026-10-02
Last Modified
2026-10-02
Generated
2026-10-02
AI Q&A
2026-10-02
EPSS Evaluated
N/A
NVD
CVE-2026-104456
EUVD
EUVD-2026-91467

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
yeswiki yeswiki to 4.6.7 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-89 The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.

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Executive Summary

YesWiki before version 4.6.7 has a second-order SQL injection flaw in the AclService::updateRequestWithACL function. Attackers can register an account with a username containing a double-quote payload. This username is stored unescaped and later used in SQL LIKE clauses for read-ACL filtering without proper escaping, allowing SQL injection during non-admin listings.

Detection Guidance

Check YesWiki versions for 4.6.6 or earlier. Look for suspicious usernames in user registrations containing SQL payloads or special characters like double quotes. Monitor database queries for time-based or boolean blind SQL injection patterns during ACL-filtered listings.

Impact Analysis

An attacker could bypass read-ACL restrictions to access protected pages and read sensitive database contents, including password hashes. This requires only a self-registered low-privilege account and no additional interaction.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, potentially violating GDPR (data protection) and HIPAA (health information privacy) by exposing personal or health records. Compliance may be compromised due to unauthorized data disclosure.

Mitigation Strategies

Upgrade YesWiki to version 4.6.7 or later if available. Temporarily disable self-registration or enforce strict username validation to block special characters. Review database access logs for unauthorized queries or data exfiltration attempts.

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