{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86426 exists.","fix":"No fix has been published for CVE-2026-86426 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-86426 is a critical authentication bypass vulnerability in Librenms Librenms, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-86426 and fix it if it is affected.\n\nWhat it is: CVE-2026-86426 is a critical authentication bypass vulnerability in Librenms Librenms, published on 7 Sep 2026. 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-2026-86426 exists.\n\nAffected product: Librenms Librenms. 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-2026-86426/ (Markdown: https://insights.sbomify.com/CVE-2026-86426/index.md)","id":"CVE-2026-86426","markdown":"https://insights.sbomify.com/CVE-2026-86426/index.md","name":"CVE-2026-86426","record":{"aliases":["GHSA-84cr-xjpw-q9mc","GHSA-cvq8-gqfq-3mvg"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["privilege_escalation","code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Network monitoring system","requires_auth":"none","summary":"Unauthenticated attackers can bypass API authentication via type confusion to access credentials and execute remote code through alert templates.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"librenms","vendor":"librenms"}],"cvss":{"score":9.2,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"}],"description":"LibreNMS before 26.8.0 contains an authentication bypass vulnerability in the REST API that allows unauthenticated attackers to access protected endpoints by sending numeric values instead of string tokens. Attackers can exploit MySQL type coercion by sending small integers like 0 through 9 to match token hashes, gaining access to API functionality including device credentials and administrative features that enable remote code execution through alert templates.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2026-10-25","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":1,"refs":[{"date":"2026-10-25T04:54:22Z","kind":"github_poc","ref":"https://github.com/Guila95/CVE-2026-86426","stars":0,"title":"CVE-2026-86426 CHECK"},{"date":null,"kind":"nuclei","ref":"http/cves/2026/CVE-2026-86426.yaml","stars":null,"title":"LibreNMS \u003c= 26.7.0 - Unauthenticated API Access"}],"tier":"weaponised"},"has_fix":false,"headline":"LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion","id":"CVE-2026-86426","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"librenms:librenms","products":["librenms:librenms"],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"LibreNMS before 26.8.0 Argument Injection via graph_title","id":"CVE-2026-86427"},"packages":[],"prev":{"headline":"ImageMagick before 7.1.2-30 Heap-use-after-free via Layer","id":"CVE-2026-86425"},"products":["librenms"],"published":"2026-09-07","related":[{"cvss_score":9.8,"headline":"Cross-site Scripting (XSS) - Stored in librenms/librenms","id":"CVE-2023-4982","kev_date_added":null,"published":"2023-09-15"},{"cvss_score":9.8,"headline":"Command injection in librenms","id":"CVE-2022-29712","kev_date_added":null,"published":"2022-05-31"},{"cvss_score":9.8,"headline":"Path traversal in librenms/librenms","id":"CVE-2021-44278","kev_date_added":null,"published":"2021-12-03"},{"cvss_score":9.8,"headline":"LibreNMS Information Disclosure","id":"CVE-2019-10665","kev_date_added":null,"published":"2019-09-09"},{"cvss_score":9.8,"headline":"LibreNMS arbitrary OS commands execution","id":"CVE-2018-20434","kev_date_added":null,"published":"2019-04-24"},{"cvss_score":9.3,"headline":"LibreNMS: SQL Injection in ajax_table.php spreads through a covert data stream","id":"CVE-2026-26988","kev_date_added":null,"published":"2026-02-20"}],"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)"},{"class":"attribution","licence":"MIT","name":"Nuclei templates"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-09-08","vendors":["librenms"]},"summary":"Unauthenticated attackers can bypass API authentication via type confusion to access credentials and execute remote code through alert templates.","url":"https://insights.sbomify.com/CVE-2026-86426/"}