CVE-2026-39349 orangehrm CVE debrief

Who should care

Organizations using OrangeHRM Open Source versions 5.0 through 5.8 should prioritize updating to version 5.8.1 to mitigate potential data exposure through pattern disclosure. This update is crucial for maintaining the security of sensitive data. Additionally, organizations should review their current encryption practices, assess the sensitivity of encrypted data, and consider implementing more secure encryption modes like GCM. Affected operators, platform administrators, vulnerability management teams, and security teams should be aware of the potential impacts and take necessary actions to protect their systems.

Technical summary

The encryption of sensitive fields in OrangeHRM Open Source versions 5.0 through 5.8 utilizes AES in ECB (Electronic Codebook) mode. ECB mode is considered insecure for encrypting data that contains patterns or structures because it does not use an initialization vector (IV) and encrypts identical plaintext blocks to identical ciphertext blocks. This property can allow an attacker to infer information about the encrypted data by analyzing the ciphertext patterns. The vulnerability is particularly concerning for data that may contain repetitive or predictable information. The fix in version 5.8.1 likely involves changing the encryption mode to a more secure one, such as GCM (Galois/Counter Mode), which provides both confidentiality and integrity.

Defensive priority

Medium

Recommended defensive actions

• Inventory and update: Verify the use of OrangeHRM Open Source and check if the version is between 5.0 and 5.8. Prioritize updating to version 5.8.1 or later.
• Review encryption practices: Assess the sensitivity of data being encrypted and consider enhancing encryption methods to more secure modes like GCM.
• Monitor for suspicious activity: Regularly monitor encrypted data for patterns that could indicate unauthorized access or data manipulation.
• Implement compensating controls: Consider additional security measures such as data masking or tokenization for highly sensitive fields.
• Exception tracking: Establish processes to track and address any exceptions or failures in the encryption and decryption processes.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability in OrangeHRM Open Source. The vendor advisory on GitHub offers mitigation guidance. However, the extent of affected data and specific patterns vulnerable to disclosure are not detailed, suggesting a need for thorough inventory and data sensitivity assessments.

Official resources