osTicket 1.18.3 Key Generation include/class.api.php entropy

Summaryinfo

A vulnerability classified as problematic was found in osTicket 1.18.3. The affected element is an unknown function of the file include/class.api.php of the component Key Generation. The manipulation results in entropy. This vulnerability is cataloged as CVE-2026-38447. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in osTicket 1.18.3. Affected is an unknown function of the file include/class.api.php of the component Key Generation. The manipulation with an unknown input leads to a entropy vulnerability. CWE is classifying the issue as CWE-331. The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-38447 since 04/06/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1600.001.

By approaching the search of inurl:include/class.api.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-52402). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Ticket Tracking Software

Name

• osTicket

Version

• 1.18.3

License

• open-source

Website

• Product: https://github.com/osTicket/osTicket/

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion