Vulnerability · Published Aug 28, 2026 · Assigned by GitHub_M
CVE-2026-55566Yamcs: DOM XSS in Extension Routing
Medium 4.3
In plain English
A medium-severity cross-site scripting in yamcs from yamcs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.yamcs:yamcs-core | 5.13.2 | GHSA-9272-wg2r-7xmx |
| Maven | org.yamcs:yamcs-core | 5.12.8 | GHSA-9272-wg2r-7xmx |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
References
- https://github.com/yamcs/yamcs/security/advisories/GHSA-9272-wg2r-7xmx x_refsource_CONFIRM
- https://github.com/yamcs/yamcs/commit/8e18e279d8ce761c21f4f67bbd06a1bff804d297 x_refsource_MISC
- https://github.com/yamcs/yamcs/commit/ecf34a4e2ccbe085e6ceff0253595b24d5ecb4aa x_refsource_MISC
- https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8 x_refsource_MISC
- https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2 x_refsource_MISC