CVE-2026-18403
Received Received - Intake

Authenticated SQL Injection in LimeSurvey Community Edition

Publication date: 2026-08-14

Last updated on: 2026-08-14

Assigner: Fluid Attacks

Description
LimeSurvey Community Edition 7.0.5 contains an authenticated SQL injection vulnerability in the Central Participant Database (CPDB) workflow that copies survey participant tokens to the central participant list.

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Meta Information

Published
2026-08-14
Last Modified
2026-08-14
Generated
2026-08-14
AI Q&A
2026-08-14
EPSS Evaluated
N/A
NVD
CVE-2026-18403
EUVD
EUVD-2026-58786

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
limesurvey limesurvey 7.0.5
limesurvey limesurvey From 7.0.10 (inc)

Helpful Resources

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.

Attack-Flow Graph

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Executive Summary

LimeSurvey Community Edition 7.0.5 has an authenticated SQL injection vulnerability in the Central Participant Database (CPDB) workflow. This flaw allows low-privileged users to inject malicious SQL code by manipulating token-to-CPDB attribute mappings. The system fails to validate input properly, enabling attackers to execute arbitrary SQL queries against the database.

Detection Guidance

To detect this vulnerability, check if your LimeSurvey instance is running version 7.0.5 or earlier. Inspect the Participant.php file for the use of parameterized queries in updateTokenAttributeValue and updateAttributeValueToken methods. Review logs for unusual SQL queries or unauthorized data access patterns in the Central Participant Database workflow.

Impact Analysis

An attacker could extract sensitive data like administrator usernames and password hashes from the lime_users table. They may also perform data aggregation attacks using MySQL functions like GROUP_CONCAT and retrieve stolen data through normal API endpoints.

Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. Organizations using vulnerable versions risk non-compliance and potential regulatory penalties.

Mitigation Strategies

Immediately update LimeSurvey to version 7.0.10 or later to patch the vulnerability. Ensure all authenticated users have minimal necessary permissions, particularly restricting participantpanel:read access. Review and sanitize all user inputs in the CPDB workflow to prevent SQL injection attempts.

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