CVE-2026-55566
Yamcs: DOM XSS in Extension Routing
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | yamcs |
| Product | yamcs |
| Published | Aug 28, 2026 |
| Last Updated | Aug 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
yamcs / yamcs
< 5.12.8 >= 5.13.0, < 5.13.2
References
github.com: https://github.com/yamcs/yamcs/security/advisories/GHSA-9272-wg2r-7xmx github.com: https://github.com/yamcs/yamcs/commit/8e18e279d8ce761c21f4f67bbd06a1bff804d297 github.com: https://github.com/yamcs/yamcs/commit/ecf34a4e2ccbe085e6ceff0253595b24d5ecb4aa github.com: https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8 github.com: https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2