{"answers":{"affected":"3 open source packages ship an affected version, including github.com/geiserx/genieacs-mcp.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55637 exists.","fix":"Upgrade github.com/geiserx/genieacs-mcp to 0.3.2 or later.","what":"CVE-2026-55637 is a high-severity server-side request forgery vulnerability in GeiserX genieacs-mcp, published on 25 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-2026-55637 and fix it if it is affected.\n\nWhat it is: CVE-2026-55637 is a high-severity server-side request forgery vulnerability in GeiserX genieacs-mcp, published on 25 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-2026-55637 exists.\n\nAffected packages and fixed versions:\n- github.com/geiserx/genieacs-mcp (Go): affected all versions; fixed in 0.3.2\n- github.com/geiserx/genieacs-mcp (Go): affected all versions; fixed in 0.3.2\n- github.com/geiserx/genieacs-mcp (Go): affected all versions; fixed in 0.3.2\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-2026-55637/ (Markdown: https://insights.sbomify.com/CVE-2026-55637/index.md)","id":"CVE-2026-55637","markdown":"https://insights.sbomify.com/CVE-2026-55637/index.md","name":"CVE-2026-55637","record":{"aliases":["GHSA-cmwv-wf9p-p8wx","GO-2026-6295"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"GenieACS MCP server","requires_auth":"none","summary":"Attacker uses DNS rebinding to access local MCP server, exposing or modifying GenieACS CPE management state via unauthenticated HTTP listener.","user_interaction":"required","vuln_class":"ssrf"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.8,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N","version":"4.0"},"cwes":[{"id":"CWE-346","name":"Origin Validation Error"}],"description":"genieacs-mcp is an MCP server for GenieACS written in Go. Prior to 0.3.2, the Streamable HTTP transport in cmd/server/main.go creates an unauthenticated /mcp listener on the default MCP_LISTEN_ADDR value 127.0.0.1:8080 when MCP_AUTH_TOKEN is unset and the httpSrv.Start(addr) branch does not validate the Host or Origin headers. A malicious website can use DNS rebinding to send browser requests with attacker-controlled Host and Origin values to the loopback listener, initialize an MCP session, list tools, and invoke operations against the GenieACS NBI configured by ACS_URL. Successful exploitation can expose or modify CPE management state, including device reboots, firmware tasks, TR-069 parameter changes, presets, provisions, tags, connection requests, and task operations. The npm wrapper is not affected because it forces TRANSPORT=stdio and does not expose an HTTP listener. This issue is fixed in version 0.3.2.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"genieacs-mcp: DNS rebinding reaches local GenieACS MCP Streamable HTTP transport","id":"CVE-2026-55637","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"ssrf","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass","id":"CVE-2026-55638"},"packages":[{"ecosystem":"Go","fixed":["0.3.2"],"introduced":["0"],"last_affected":[],"package":"github.com/geiserx/genieacs-mcp","purl":null,"source":"GHSA-cmwv-wf9p-p8wx"},{"ecosystem":"Go","fixed":["0.3.2"],"introduced":["0"],"last_affected":[],"package":"github.com/geiserx/genieacs-mcp","purl":"pkg:golang/github.com/geiserx/genieacs-mcp","source":"GHSA-cmwv-wf9p-p8wx"},{"ecosystem":"Go","fixed":["0.3.2"],"introduced":["0"],"last_affected":[],"package":"github.com/geiserx/genieacs-mcp","purl":"pkg:golang/github.com/geiserx/genieacs-mcp","source":"GO-2026-6295"}],"prev":{"headline":"Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected","id":"CVE-2026-55636"},"products":["genieacs-mcp"],"published":"2026-08-25","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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-25","vendors":["GeiserX"]},"summary":"Attacker uses DNS rebinding to access local MCP server, exposing or modifying GenieACS CPE management state via unauthenticated HTTP listener.","url":"https://insights.sbomify.com/CVE-2026-55637/"}