CVE-2026-4800

Description

Impact:The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. Both paths flow into the same Function() constructor sink.When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time.Additionally, _.template uses assignInWith to merge imports, which enumerates inherited properties via for..in. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function().Patches:Users should upgrade to version 4.18.0.Workarounds:Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.

Risk Information

Base Score

9.8

MODERATE

Vector

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

EPSS Score

Exploitation Probability

0.089

Associated Vulnerability

Vulnerability	OS Platform
Multiple Vulnerabilities are affected in IBM Aspera Faspex 5.0.15	Windows
Multiple Vulnerabilities are affected in IBM App Connect Enterprise 12.0.12.24	Windows
Multiple Vulnerabilities are affected in IBM App Connect Enterprise 13.0.7.0	Windows

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234