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Vulnerability record · CVE-2026-46562 · published 16 July 2026

CVE-2026-46562: Spaceapplications yamcs code injection vulnerability

Spaceapplications · Yamcs

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.

9.8 CVSS 3.1 Critical EPSS 0.98% · top 39.4% CWE-94 · Code injectionCWE-95 · CWE-95
9.8CVSS 3.1 base score
0.98%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
20 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/yamcs/yamcs/commit/3c550348f866af4675d2ba4a51d8d12b7c7c6011 Patch
https://github.com/yamcs/yamcs/commit/4ff8fda642ea8c3309a4d3f379aa77b763148992 Patch
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7 Release Notes
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0 Release Notes
https://github.com/yamcs/yamcs/security/advisories/GHSA-vmwp-vh32-rj75 ExploitVendor Advisory
https://github.com/yamcs/yamcs/security/advisories/GHSA-vmwp-vh32-rj75 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-44596Spaceapplications yamcs improper restriction of authentication attempts vulnerabilityYamcs is a mission control framework. Prior to 5.12.7, the authentication endpoint POST /auth/token in yamcs-core, handled by yamcs-core/src/main/jav…EPSS 2.1%9.1CVE-2026-46621Spaceapplications yamcs code injection vulnerabilityYamcs is a mission control framework. Prior to 5.12.7, the Yamcs script evaluation engine for Python algorithms dynamically compiled and evaluated us…EPSS 1.1%9.1CVE-2026-44632Spaceapplications yamcs code injection vulnerabilityYamcs is a mission control framework. Prior to 5.12.7, a server-side code injection vulnerability existed in the Yamcs algorithm evaluation engine or…EPSS 1.1%9.1CVE-2023-45278Spaceapplications yamcs path traversal vulnerabilityDirectory Traversal vulnerability in the storage functionality of the API in Yamcs 5.8.6 allows attackers to delete arbitrary files via crafted HTTP …EPSS 1.6%7.5CVE-2023-45277Spaceapplications yamcs path traversal vulnerabilityYamcs 5.8.6 is vulnerable to directory traversal (issue 1 of 2). The vulnerability is in the storage functionality of the API and allows one to escap…EPSS 1.0%6.1CVE-2023-45281Spaceapplications yamcs cross-site scripting vulnerabilityAn issue in Yamcs 5.8.6 allows attackers to obtain the session cookie via upload of crafted HTML file.EPSS 0.41%5.4CVE-2023-45279Spaceapplications yamcs cross-site scripting vulnerabilityYamcs 5.8.6 allows XSS (issue 1 of 2). It comes with a Bucket as its primary storage mechanism. Buckets allow for the upload of any file. There's a w…EPSS 0.43%5.4CVE-2023-45280Spaceapplications yamcs cross-site scripting vulnerabilityYamcs 5.8.6 allows XSS (issue 2 of 2). It comes with a Bucket as its primary storage mechanism. Buckets allow for the upload of any file. There's a w…EPSS 0.53%

Source: NIST National Vulnerability Database (record CVE-2026-46562), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.