{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34256 exists.","fix":"No fix has been published for CVE-2025-34256 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-34256 is a critical vulnerability in Advantech Co., Ltd. WISE-DeviceOn Server, published on 5 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-34256 and fix it if it is affected.\n\nWhat it is: CVE-2025-34256 is a critical vulnerability in Advantech Co., Ltd. WISE-DeviceOn Server, published on 5 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34256 exists.\n\nAffected product: Advantech Co., Ltd. WISE-DeviceOn Server. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2025-34256/ (Markdown: https://insights.sbomify.com/CVE-2025-34256/index.md)","id":"CVE-2025-34256","markdown":"https://insights.sbomify.com/CVE-2025-34256/index.md","name":"CVE-2025-34256","record":{"aliases":["GHSA-vqjp-fh8j-rf3j"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["privilege_escalation","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"IoT device management server","requires_auth":"none","summary":"Remote attackers can bypass authentication using a hard-coded JWT key to impersonate any user, including admins, and execute code on managed devices.","user_interaction":"not_required","vuln_class":"hardcoded_credentials"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"wise-deviceon_server","vendor":"advantech"}],"cvss":{"score":10,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0"},"cwes":[{"id":"CWE-321","name":"Use of Hard-coded Cryptographic Key"}],"description":"Advantech WISE-DeviceOn Server versions prior to 5.4 contain a hard-coded cryptographic key vulnerability. The product uses a static HS512 HMAC secret for signing EIRMMToken JWTs across all installations. The server accepts forged JWTs that need only contain a valid email claim, allowing a remote unauthenticated attacker to generate arbitrary tokens and impersonate any DeviceOn account, including the root super admin. Successful exploitation permits full administrative control of the DeviceOn instance and can be leveraged to execute code on managed agents through DeviceOn’s remote management features.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":null,"headline":"Advantech WISE-DeviceOn Server \u003c 5.4 Hard-coded JWT Key Authentication Bypass","id":"CVE-2025-34256","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"hardcoded_credentials","year":"2025"},"n_packages":0,"n_references":4,"next":{"headline":"Advantech WISE-DeviceOn Server \u003c 5.4 Authenticated Stored XSS via action/defined","id":"CVE-2025-34257"},"packages":[],"prev":{"headline":"D-Link Nuclias Connect \u003c= v1.3.1.4 Forgot Password Account Enumeration","id":"CVE-2025-34255"},"products":["WISE-DeviceOn Server"],"published":"2025-12-05","related":[{"cvss_score":5.1,"headline":"Advantech WISE-DeviceOn Server \u003c 5.4 Authenticated Stored XSS via action/defined","id":"CVE-2025-34257","kev_date_added":null,"published":"2025-12-05"},{"cvss_score":5.1,"headline":"Advantech WISE-DeviceOn Server \u003c 5.4 Authenticated Stored XSS via devicemap/plan","id":"CVE-2025-34258","kev_date_added":null,"published":"2025-12-05"},{"cvss_score":5.1,"headline":"Advantech WISE-DeviceOn Server \u003c 5.4 Authenticated Stored XSS via devicemap/building","id":"CVE-2025-34259","kev_date_added":null,"published":"2025-12-05"},{"cvss_score":5.1,"headline":"Advantech WISE-DeviceOn Server \u003c 5.4 Authenticated Stored XSS via action/schedule","id":"CVE-2025-34260","kev_date_added":null,"published":"2025-12-05"},{"cvss_score":5.1,"headline":"Advantech WISE-DeviceOn Server \u003c 5.4 Authenticated Stored XSS via devicegroups/","id":"CVE-2025-34261","kev_date_added":null,"published":"2025-12-05"},{"cvss_score":5.1,"headline":"Advantech WISE-DeviceOn Server \u003c 5.4 Authenticated Stored XSS via devices/name/{agent_id}","id":"CVE-2025-34262","kev_date_added":null,"published":"2025-12-05"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-14","vendors":["Advantech Co., Ltd."]},"summary":"Remote attackers can bypass authentication using a hard-coded JWT key to impersonate any user, including admins, and execute code on managed devices.","url":"https://insights.sbomify.com/CVE-2025-34256/"}