CVE-2026-55566

{"id": "CVE-2026-55566", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55566", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-28T20:30:29.994741Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "yamcs", "product": "yamcs", "versions": [{"status": "affected", "version": "< 5.12.8"}, {"status": "affected", "version": ">= 5.13.0, < 5.13.2"}]}]}], "published": "2026-08-28T20:18:29.207", "references": [{"url": "https://github.com/yamcs/yamcs/commit/8e18e279d8ce761c21f4f67bbd06a1bff804d297", "source": "security-advisories@github.com"}, {"url": "https://github.com/yamcs/yamcs/commit/ecf34a4e2ccbe085e6ceff0253595b24d5ecb4aa", "source": "security-advisories@github.com"}, {"url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8", "source": "security-advisories@github.com"}, {"url": "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2", "source": "security-advisories@github.com"}, {"url": "https://github.com/yamcs/yamcs/security/advisories/GHSA-9272-wg2r-7xmx", "source": "security-advisories@github.com"}, {"url": "https://github.com/yamcs/yamcs/security/advisories/GHSA-9272-wg2r-7xmx", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-09-08T21:08:37.320", "sourceIdentifier": "security-advisories@github.com"}