On April 9, 2026, a medium-severity Cross Site Scripting vulnerability was reported in Limesurvey version 6.15.20+251021. This vulnerability allows a remote attacker to execute arbitrary code via the Box[title] and box[url] parameters. With a CVSS score of 6.1, the vulnerability presents a tangible risk to organizations using this software, making it imperative for them to address it promptly.
The vulnerability is categorized under CWE-79, indicating that it falls within the realm of Cross Site Scripting vulnerabilities. The attack vector is network-based, with low complexity, no privileges required, and user interaction necessary. While the availability impact is none, both confidentiality and integrity impacts are deemed low.
Organizations should prioritize patching immediately. The nature of this vulnerability allows remote attackers to exploit it under certain conditions, which could lead to unauthorized access to sensitive data or system functionalities.
Currently, there are no known public exploits or proof of concepts available for this vulnerability. However, the absence of confirmed exploits does not mitigate the potential risk posed by this vulnerability.
Organizations utilizing Limesurvey should remain vigilant and ensure they are running the latest version of the software to mitigate this risk effectively.
Vulnerability Details
According to the official CVE description, this vulnerability allows a remote attacker to execute arbitrary code via the Box[title] and box[url] parameters. The affected version is Limesurvey v6.15.20+251021. The vulnerability has a CVSS score of 6.1, classified as medium severity due to its potential impact.
The CVSS vector indicates that the attack can occur over a network with low complexity, requiring user interaction, and no privileges are necessary for exploitation. The impacts on confidentiality and integrity are both low, with no impact on availability.
The vulnerability was published on April 9, 2026, and is currently under analysis. The associated CWE classification is CWE-79.
Technical Analysis
The root cause of this vulnerability lies in improper validation of user input in the Box[title] and box[url] parameters. Attackers may leverage this weakness to inject malicious scripts that can execute in the context of the victim's session.
The attack vector is network-based, meaning that an attacker does not need physical access to the target system. The attack complexity is low, as the vulnerability can be exploited without any special conditions. No privileges are required, and user interaction is essential, as the victim must interact with the malicious payload.
The confidentiality impact is low, meaning that data exposure is limited, while the integrity impact is also low, indicating that the attacker may alter data but with limited effect. There is no impact on availability, ensuring that the service remains operational.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive information and system functionalities due to exploitation of the Cross Site Scripting vulnerability. The blast radius could be significant, as the vulnerability affects all users interacting with the vulnerable version of Limesurvey.
Organizations should assess the urgency of addressing this vulnerability based on their deployment of Limesurvey. Given its medium CVSS score and the potential for exploitation, this vulnerability should be prioritized in the patching cycle.
Although it is not currently listed as actively exploited in the Known Exploited Vulnerabilities (KEV) database, organizations should remain proactive in their defense strategies.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected version of Limesurvey is 6.15.20+251021. Organizations should ensure they are running a patched version of the software. If version information is missing, it is recommended to state that all versions prior to vendor patch are vulnerable.
Mitigation & Remediation
Organizations should implement the latest patches for Limesurvey to remediate this vulnerability immediately. If a patch is not yet available, consider applying configuration hardening measures to restrict the impact of potential exploitation. Regular network controls and monitoring for unusual activities are also recommended.Continuous penetration testing can help identify similar weaknesses in the system.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts. Behavioral anomalies in user interactions, particularly involving the Box[title] and box[url] parameters, should be flagged for further investigation.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights the ongoing challenges of securing web applications against Cross Site Scripting attacks. This incident represents a pattern where attackers exploit input validation weaknesses, which should prompt security teams to review their practices.
Organizations should take this opportunity to strengthen their application security posture by developing a comprehensive vulnerability management program and implementing robust security testing methodologies.
Additionally, the increasing prevalence of Cross Site Scripting vulnerabilities necessitates that organizations prioritize security training for their developers, focusing on secure coding practices to prevent similar vulnerabilities in the future.
Lastly, organizations should consider leveraging web application penetration testing as a means to identify and remediate potential vulnerabilities proactively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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