{"id":"CVE-2026-55566","aliases":["GHSA-9272-wg2r-7xmx"],"url":"https://o3.security/vulnerability/CVE-2026-55566","summary":"Yamcs: DOM XSS in Extension Routing","details":"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.","published":"2026-08-28T17:31:39.197Z","modified":"2026-08-29T11:46:54.739578134Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N"},"epss":{"score":0.00274,"percentile":0.19362,"asOf":"2026-08-29"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.yamcs:yamcs-core","fixedVersion":"5.13.2"},{"ecosystem":"Maven","name":"org.yamcs:yamcs-core","fixedVersion":"5.12.8"}],"fix":{"url":"https://github.com/yamcs/yamcs/commit/8e18e279d8ce761c21f4f67bbd06a1bff804d297","label":"yamcs/yamcs@8e18e27"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55566.json"},{"type":"FIX","url":"https://github.com/yamcs/yamcs/commit/8e18e279d8ce761c21f4f67bbd06a1bff804d297"},{"type":"FIX","url":"https://github.com/yamcs/yamcs/commit/ecf34a4e2ccbe085e6ceff0253595b24d5ecb4aa"},{"type":"WEB","url":"https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8"},{"type":"WEB","url":"https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2"},{"type":"ADVISORY","url":"https://github.com/yamcs/yamcs/security/advisories/GHSA-9272-wg2r-7xmx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55566"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-29T11:46:54.739578134Z"}}