EUVD-2026-10880

Comprehensive Technical Analysis of EUVD-2026-10880

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2026-10880 pertains to the Parse Server, which is susceptible to session token exfiltration through the redirectClassNameForKey query parameter. The CVSS (Common Vulnerability Scoring System) base score of 9.9 indicates a critical severity level. This high score is attributed to the following factors:

• Attack Vector (AV:N): The vulnerability can be exploited over the network.
• Attack Complexity (AC:L): The attack requires low complexity.
• Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
• User Interaction (UI:N): No user interaction is needed.
• Confidentiality Impact (VC:H): High impact on confidentiality.
• Integrity Impact (VI:H): High impact on integrity.
• Availability Impact (VA:N): No impact on availability.
• Scope Change (SC:H): The scope of the vulnerability is high.
• Scope Impact (SI:H): High impact within the changed scope.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves manipulating the redirectClassNameForKey query parameter to exfiltrate session tokens. An attacker could exploit this vulnerability by:

• Crafting Malicious Requests: Sending specially crafted HTTP requests to the Parse Server that include the redirectClassNameForKey parameter.
• Session Hijacking: Once the session token is exfiltrated, the attacker can hijack user sessions, leading to unauthorized access to sensitive data.
• Data Exfiltration: The attacker can exfiltrate sensitive information by leveraging the compromised session tokens.

3. Affected Systems and Software Versions

The vulnerability affects the following versions of Parse Server:

• Parse Server versions < 8.6.21
• Parse Server versions 9.0.0 < 9.5.2-alpha.8

Organizations using these versions are at risk and should prioritize updating to the patched versions.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following steps are recommended:

• Update to Patched Versions: Immediately update to Parse Server version 8.6.21 or 9.5.2-alpha.8, which include the necessary security patches.
• Network Segmentation: Implement network segmentation to limit the exposure of vulnerable systems.
• Monitoring and Logging: Enhance monitoring and logging to detect any suspicious activities related to session token exfiltration.
• Access Controls: Implement strict access controls and authentication mechanisms to minimize unauthorized access.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security gaps.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant threat to the European cybersecurity landscape, particularly for organizations that rely on Parse Server for backend services. The potential for session token exfiltration can lead to data breaches, unauthorized access, and loss of sensitive information. This underscores the importance of timely patch management and proactive security measures to safeguard against such vulnerabilities.

6. Technical Details for Security Professionals

For security professionals, the following technical details are crucial:

• Vulnerability Identification: The vulnerability is identified by CVE-2026-30965 and EUVD-2026-10880.
• Exploitation Mechanism: The exploitation involves manipulating the redirectClassNameForKey query parameter to exfiltrate session tokens.
• Detection Methods: Implement intrusion detection systems (IDS) and intrusion prevention systems (IPS) to detect and block malicious requests targeting the redirectClassNameForKey parameter.
• Patch Availability: Patches are available in Parse Server versions 8.6.21 and 9.5.2-alpha.8.
• References:
  • GitHub Security Advisory
  • Parse Server Release 8.6.21
  • Parse Server Release 9.5.2-alpha.8
  • NVD Detail

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of session token exfiltration and protect their sensitive data.