CVE-2026-100748 in Event Gallery Extension
Summary
by MITRE • 09/27/2026
Joomla Extension - svenbluege.de - CSRF in various cart actions in Event Gallery extension < 6.5.0
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Analysis
by VulDB Data Team • 09/27/2026
The Joomla Event Gallery extension, developed by Sven Bluege and distributed through the official repository at svenbluege.de, contains a critical Cross-Site Request Forgery vulnerability affecting versions prior to 6.5.0. This security flaw is present in multiple cart-related actions within the application's administrative interface or frontend components that handle transactional data. The vulnerability stems from an insufficient implementation of anti-CSRF tokens or session validation mechanisms when processing requests related to shopping cart operations, such as adding items, updating quantities, or removing products. In a typical web application architecture, these actions require state-changing HTTP POST requests that modify the database or user-specific data structures without requiring explicit re-authentication for every step if the initial login is maintained via cookies or sessions.
The technical nature of this flaw allows an attacker to craft malicious HTML pages or scripts containing forged requests targeting specific endpoints within the Event Gallery extension. Because the application fails to verify a unique, secret token associated with the user's current session in these particular cart actions, any request sent by a logged-in administrator or authorized user will be accepted and executed as if it originated from the legitimate interface. This bypasses the intended security controls that rely on same-origin policies and CSRF protection mechanisms designed to prevent unauthorized command execution. The attacker does not need to know the victim's credentials; they only need to trick the victim, who is currently authenticated with a session cookie for the Joomla site hosting the vulnerable extension, into loading the malicious payload or clicking a crafted link.
The operational impact of this vulnerability can be severe depending on the privileges held by the targeted user account. If an administrator is exploited, the attacker could manipulate cart data to facilitate fraudulent transactions, alter pricing structures, or potentially use the compromised administrative context to inject further malware or backdoors into the Joomla installation through other available vectors that might also lack proper validation. For lower-privileged users, such as event organizers or shop managers, the impact involves unauthorized modification of sales records, inventory levels, or customer data associated with their specific cart operations. This undermines the integrity of e-commerce functions integrated within the Event Gallery extension and can lead to financial loss, reputational damage, and compliance violations regarding data protection standards like GDPR if personal data is altered or exfiltrated through these forged requests.
From a classification perspective, this vulnerability aligns with CWE-352: Cross-Site Request Forgery (CSRF), which describes the failure of an application to verify that a request was intentionally initiated by the user rather than by some third party. In terms of offensive security frameworks, this exploit technique corresponds to MITRE ATT&CK Tactic TA0001 Initial Access or TA0005 Defense Evasion depending on whether it is used for initial compromise via social engineering or as part of a broader attack chain to maintain persistence and modify system state without detection. The lack of proper request validation represents a fundamental weakness in the application's security design, allowing attackers to leverage trusted relationships between browsers and web applications to perform unauthorized actions.
Mitigation strategies must focus on immediate remediation through software updates and enhanced defensive coding practices. Users running versions of Event Gallery earlier than 6.5.0 should upgrade to the latest patched version immediately upon release by Sven Bluege, as this update is expected to implement robust CSRF token validation for all cart-related endpoints. In environments where patching cannot occur instantly due to operational constraints or compatibility testing requirements, temporary mitigations include implementing strict Content Security Policy headers that restrict form submissions and utilizing server-side session management techniques such as double-submit cookies or custom header verification. Additionally, enforcing SameSite cookie attributes on session identifiers can significantly reduce the risk of CSRF attacks by preventing browsers from sending these cookies in cross-site requests. Regular security audits and penetration testing focusing on state-changing operations are recommended to identify similar weaknesses across other extensions within the Joomla ecosystem.