PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-38447 osTicket CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-03T19:16:46.917Z and has not been modified since then. The osTicket 1.18.3 application generates API keys using a predictable construction based on MD5 hashing. This approach, combined with the use of predictable inputs like the current timestamp and client IP address, significantly reduces the entropy of the generated keys. As a result, an attacker can approximate the key generation time and brute-force the key space within a feasible time window, potentially leading to unauthorized access. osTicket administrators and users should review their API key usage and consider upgrading to a newer version of osTicket that may address this vulnerability.

Vendor
osTicket
Product
osTicket
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-03
Original CVE updated
2026-08-31
Advisory published
2026-08-03
Advisory updated
2026-08-31

Who should care

osTicket administrators and users, security teams monitoring for potential API key compromise, and developers using osTicket API keys for integrations. Additionally, operators of osTicket installations, platform administrators, vulnerability management teams, and security teams should be aware of the potential impact of this vulnerability on their systems and take necessary precautions to mitigate the risk.

Technical summary

The osTicket 1.18.3 application generates API keys using a predictable construction based on MD5 hashing. This approach, combined with the use of predictable inputs like the current timestamp and client IP address, significantly reduces the entropy of the generated keys. As a result, an attacker can approximate the key generation time and brute-force the key space within a feasible time window, potentially leading to unauthorized access.

Defensive priority

Immediate attention is required due to the critical CVSS score of 9.8. osTicket 1.18.3 generates API keys using a predictable construction based on MD5 hashing, which significantly reduces entropy.

Recommended defensive actions

  • Inventory osTicket installations and verify API key usage.
  • Implement additional authentication mechanisms to mitigate potential API key compromise.
  • Consider upgrading to a newer version of osTicket that may address this vulnerability.
  • Monitor API key usage and logs for suspicious activity.
  • Restrict access to sensitive areas of the osTicket installation.

Evidence notes

The CVE description states that 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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-38447 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-38447

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-38447 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-38447

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.