{"answers":{"affected":"2 open source packages ship an affected version, including org.yamcs:yamcs-core.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55549 exists.","fix":"Upgrade org.yamcs:yamcs-core to 5.9.4 or later.","what":"CVE-2026-55549 is a medium-severity cross-site scripting vulnerability in yamcs, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-55549 and fix it if it is affected.\n\nWhat it is: CVE-2026-55549 is a medium-severity cross-site scripting vulnerability in yamcs, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55549 exists.\n\nAffected packages and fixed versions:\n- org.yamcs:yamcs-core (Maven): affected all versions; fixed in 5.9.4\n- org.yamcs:yamcs-core (Maven): affected all versions; fixed in 5.9.4\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-55549/ (Markdown: https://insights.sbomify.com/CVE-2026-55549/index.md)","id":"CVE-2026-55549","markdown":"https://insights.sbomify.com/CVE-2026-55549/index.md","name":"CVE-2026-55549","record":{"aliases":["GHSA-rxpg-wjf8-qv9c"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Yamcs mission control","requires_auth":"none","summary":"Attackers can execute JavaScript via a crafted authorization URL, potentially stealing authentication tokens and compromising user accounts.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Yamcs is a mission control framework. Prior to 5.9.4, Yamcs reflects an attacker-controlled redirect_uri parameter from GET /auth/authorize into yamcs-core/src/main/resources/auth/templates/authorize.html without adequate HTML escaping by yamcs-core/src/main/java/org/yamcs/http/auth/AuthHandler.java and yamcs-core/src/main/java/org/yamcs/http/HandlerContext.java. A crafted authorization URL can execute JavaScript when opened by a Yamcs user. The script can access browser-held authentication material and transmit it to an attacker, enabling account compromise. This issue is fixed in version 5.9.4.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":1,"refs":[{"date":null,"kind":"nuclei","ref":"http/cves/2026/CVE-2026-55549.yaml","stars":null,"title":"Yamcs \u003c=5.8.6 - Cross-Site Scripting"}],"tier":"weaponised"},"has_fix":true,"headline":"Yamcs: Reflected XSS in the URL of the Authorize Endpoint","id":"CVE-2026-55549","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"NextCRM has RBAC Bypass in MCP Product Tools that Allows Low-Privileged Users to Modify the CRM Product Catalog","id":"CVE-2026-55550"},"packages":[{"ecosystem":"Maven","fixed":["5.9.4"],"introduced":["0"],"last_affected":[],"package":"org.yamcs:yamcs-core","purl":null,"source":"GHSA-rxpg-wjf8-qv9c"},{"ecosystem":"Maven","fixed":["5.9.4"],"introduced":["0"],"last_affected":[],"package":"org.yamcs:yamcs-core","purl":"pkg:maven/org.yamcs/yamcs-core","source":"GHSA-rxpg-wjf8-qv9c"}],"prev":{"headline":"Yamcs: Insecure Direct Object Reference (IDOR) in PacketsApi allows unprivileged users to dump all telemetry packets","id":"CVE-2026-55548"},"products":["yamcs"],"published":"2026-08-28","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"MIT","name":"Nuclei templates"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-01","vendors":["yamcs"]},"summary":"Attackers can execute JavaScript via a crafted authorization URL, potentially stealing authentication tokens and compromising user accounts.","url":"https://insights.sbomify.com/CVE-2026-55549/"}