CWE-1104: Use of Unmaintained Third Party Components
The product relies on third-party components that are not actively supported or maintained by the original developer or a trusted proxy for the original developer.
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Overview
CWE-1104 (Use of Unmaintained Third Party Components) is a base-level software weakness catalogued by MITRE in the Common Weakness Enumeration (CWE). It describes a recurring type of mistake that can lead to exploitable security vulnerabilities.
Real-world CVEs
24 recorded CVEs are caused by CWE-1104 (Use of Unmaintained Third Party Components). The highest-severity and most recent are shown first. 13 new CWE-1104 CVEs have been recorded so far in 2026 (6 in 2025).
- CVE-2025-12104
Incorrect Content-Type Header
Critical · CVSS 10.0 · EPSS 33th2025-10-23 - CVE-2026-66788
Lighthouse: lighthouse: arbitrary namespace injection via attacker-controlled broker label
Critical · CVSS 9.9 · EPSS 50th2026-08-20 - CVE-2026-16634
TOML::XS versions before 0.06 for Perl bundle an unsupported and vulnerable version of tomlc99
Critical · CVSS 9.8 · EPSS 57th