CVE-2026-38447 (CVSS 9.8)

Description

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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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0046

Probability of exploitation

0.38%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-331 CWE-331

References

Other References

https://github.com/fr3akhacks/cve-disclosures/blob/master/osTicket/CVE-2026-38447.md https://github.com/osTicket/osTicket/blob/v1.18.3/include/class.api.php#L149 https://github.com/osTicket/osTicket/blob/v1.18.3/include/class.misc.php https://github.com/osTicket/osTicket/commit/feccb6a3a90863fd31215ee738b39762177e658c

Frequently Asked Questions

What is CVE-2026-38447? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-38447? +

CVE-2026-38447 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0046, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-38447? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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