CVE-2026-18403 in LimeSurvey
Summary
by MITRE • 08/14/2026
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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Analysis
by VulDB Data Team • 08/14/2026
The authenticated sql injection vulnerability in LimeSurvey Community Edition 7.0.5 represents a critical security flaw within the Central Participant Database workflow that affects the copy operation of survey participant tokens. This vulnerability specifically targets the cpdb functionality where user data is transferred from individual survey databases to a centralized participant list system. The issue arises when authenticated users with appropriate permissions attempt to utilize the token copying feature, creating an opportunity for malicious actors to exploit the application's database interaction mechanisms.
The technical implementation of this vulnerability stems from insufficient input validation and parameter sanitization within the cpdb workflow components. When survey participant tokens are copied to the central database, the application fails to properly sanitize user-supplied data before incorporating it into sql query structures. This allows attackers who have authenticated access to manipulate the underlying database queries through crafted input parameters, potentially enabling unauthorized data extraction, modification, or deletion operations against the centralized participant database.
The operational impact of this vulnerability extends beyond simple data exposure as it compromises the integrity and confidentiality of survey participant information stored within the central database system. Attackers with valid credentials can leverage this flaw to access sensitive participant data including personal identifiers, contact information, and potentially other survey-related metadata that may have been collected through various LimeSurvey deployments. The centralized nature of the cpdb system amplifies the potential damage as a successful exploitation could affect multiple surveys and their associated participant lists simultaneously.
Security professionals should recognize this vulnerability as aligning with common weakness enumerations such as cwe-89 sql injection, which is categorized under the broader family of injection flaws that occur when untrusted data is incorporated into database commands without proper validation. The presence of this flaw in an authenticated context suggests a potential path for privilege escalation or lateral movement within systems where LimeSurvey is deployed, especially when considering attack techniques documented under the attack pattern taxonomy such as code injection and data manipulation attacks. Organizations utilizing LimeSurvey Community Edition 7.0.5 should prioritize immediate remediation through official patches or updates provided by the LimeSurvey development team while implementing additional access controls and monitoring mechanisms to detect potential exploitation attempts.
Mitigation strategies should include applying the latest security patches from LimeSurvey developers, implementing robust input validation for all user-supplied data within the cpdb workflow, and establishing network segmentation controls to limit access to critical survey database systems. Additional protective measures may involve deploying web application firewalls to monitor for sql injection patterns, conducting regular security audits of database interactions, and maintaining detailed logging of cpdb operations to detect anomalous behavior that might indicate exploitation attempts. Organizations should also consider implementing role-based access controls that restrict the ability to perform token copying operations to only those users who absolutely require such functionality.
The vulnerability demonstrates the importance of proper input sanitization in database interaction components and highlights potential security gaps in applications that handle sensitive participant data through centralized systems. This flaw serves as a reminder of the critical need for continuous security assessment and validation of authentication workflows, particularly in survey management platforms where user privacy and data protection are paramount considerations. Organizations should also consider implementing automated vulnerability scanning tools that can detect similar injection patterns within their custom applications and ensure regular penetration testing to identify potential attack vectors before they can be exploited by malicious actors.
The remediation process should involve comprehensive testing of the patched environment to ensure that the sql injection mitigation does not introduce functional regressions or performance issues within the cpdb workflow. Security teams should also review access logs and implement monitoring alerts for unusual activity patterns related to participant database operations, as these anomalies could indicate attempted exploitation of the vulnerability. Additionally, system administrators should verify that proper backup procedures are in place to recover from potential data corruption or unauthorized modifications that might occur during exploitation attempts.
This vulnerability represents a significant concern for organizations relying on LimeSurvey for collecting sensitive survey data, particularly those subject to privacy regulations such as gdpr or ccpa where unauthorized access to participant information could result in substantial compliance violations and financial penalties. The authenticated nature of the flaw means that insider threats or compromised accounts pose additional risks that require comprehensive security awareness training and monitoring protocols to detect potential misuse of legitimate credentials for malicious purposes within the cpdb system.