CVE-2026-38447 in osTicket
Summary
by MITRE • 08/03/2026
osTicket 1.18.3 generates API keys using a predictable construction based on MD5 hashing. The use of MD5, combined with predictable inputs such as the current timestamp and client IP address, significantly reduces entropy. An attacker can approximate the key generation time and brute-force the key space within a feasible time window.
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Analysis
by VulDB Data Team • 08/03/2026
The vulnerability in osTicket 1.18.3 represents a critical cryptographic weakness that undermines the security of API authentication mechanisms. This flaw stems from the application's reliance on MD5 hashing for generating API keys, a practice that violates modern cryptographic standards and exposes systems to targeted attacks. The implementation uses predictable inputs including timestamps and client IP addresses as components in the MD5 hash construction, creating a deterministic key generation process that can be reverse-engineered by adversaries with minimal computational resources.
The technical implementation of this vulnerability demonstrates poor entropy management and inadequate randomization in the key generation algorithm. When MD5 is combined with time-based and network-based inputs, it creates a highly predictable cryptographic output space that significantly reduces the effective key length. This approach directly contravenes established security guidelines such as those outlined in CWE-330, which addresses insufficient entropy in random number generation, and CWE-327, which covers use of weak cryptographic algorithms. The predictable nature of API key generation means that an attacker who can observe or estimate the timestamp and IP address used during key creation can effectively brute force the entire key space within reasonable timeframes.
The operational impact of this vulnerability extends beyond simple credential theft to encompass complete system compromise through unauthorized API access. Attackers can exploit this weakness to gain administrative privileges, modify critical system configurations, access sensitive customer data, and perform unauthorized transactions or operations within the osTicket environment. The vulnerability aligns with ATT&CK technique T1566, which covers credential harvesting through various means including exploitation of weak authentication mechanisms. Once an attacker obtains a valid API key, they can execute arbitrary commands, manipulate ticket workflows, and potentially escalate privileges to gain deeper system access.
Mitigation strategies must address both the immediate cryptographic weakness and establish more robust authentication frameworks. Organizations should immediately implement strong random number generation for API key creation, replacing MD5 with cryptographically secure hash functions such as SHA-256 or SHA-3. The implementation should incorporate sufficient entropy sources including hardware-based randomness, system-level randomization, and unpredictable input data that cannot be easily estimated by attackers. Additionally, rate limiting and monitoring mechanisms should be deployed to detect and prevent brute force attempts against the API key generation process, while implementing multi-factor authentication for high-privilege API access. Regular security audits should validate that cryptographic implementations meet current industry standards and that no predictable patterns remain in key generation algorithms.