CVE WatchAug 28, 2026

CVE-2026-55566

Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs processes attacker-controlled data from the /ext URL route in yamcs-

CVSS

4.3

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 28, 2026 · Last modified: Aug 28, 2026 · CWE-79

EPSS · 30d

Not enough EPSS history yet.

Technical description

Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs processes attacker-controlled data from the /ext URL route in yamcs-web/src/main/webapp/projects/webapp/src/app/core/routes/extension.matcher.ts, extension.component.ts, and app.component.ts without checking registered plugin IDs before DOM rendering through innerHTML. A crafted URL can execute JavaScript when opened by a user. The script can read data available to the Yamcs web application and perform actions in the user context. This issue is fixed in versions 5.12.8 and 5.13.2.

Official references

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