CVEvulnerability

CVE-2026-46562

9.8 CRITICAL Published 2026-07-16 Modified 2026-07-20 Official page ↗
Status
Analyzed
Published
2026-07-16
Last modified
2026-07-20
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-470, CWE-94, CWE-95

Description

Yamcs is a mission control framework. Prior to 5.12.7, the Nashorn ScriptEngine used to evaluate user-supplied JavaScript algorithm text in yamcs-core/src/main/java/org/yamcs/algorithms/ScriptAlgorithmExecutorFactory.java was constructed without a ClassFilter, so a user with the ChangeMissionDatabase privilege could override an algorithm through the MdbOverrideApi.updateAlgorithm endpoint and supply JavaScript that reaches arbitrary Java classes (for example Java.type("java.lang.Runtime").getRuntime().exec(...)) to execute arbitrary OS commands as the Yamcs process; in the default configuration with no security.yaml the built-in guest user has superuser=true, making the issue reachable without authentication. This issue is fixed in versions 5.12.7 and 5.13.0, which disable algorithm editing by default.

Affected configurations

• spaceapplications yamcs (< 5.12.7)

Related

Weakness · CWE (3)

  • CWE-470 Use of Externally-Controlled Input to Select Classes or Code weakness
  • CWE-94 Improper Control of Generation of Code weakness
  • CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code weakness

References