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CVE-2026-46562

Spaceapplications Yamcs code injection

9.8 CRITICALPublic exploitEPSS 0.98%
  1. Published16 Jul 2026

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 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Spaceapplications Yamcs< 5.12.7

Remediation

Fixed in
Spaceapplications Yamcs≥ 5.12.7

References

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Frequently asked

Is CVE-2026-46562 being actively exploited?

CVE-2026-46562 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.98%.

How severe is CVE-2026-46562?

CVE-2026-46562 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.98% probability of exploitation.

Which products are affected by CVE-2026-46562?

Affected products include Spaceapplications Yamcs.

How do I fix CVE-2026-46562?

Upgrade affected software to a fixed version, for example Spaceapplications Yamcs 5.12.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-46562 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.