{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43634 exists.","fix":"No fix has been published for CVE-2026-43634 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-43634 is a high-severity authentication bypass vulnerability in hestiacp, published on 19 May 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-2026-43634 and fix it if it is affected.\n\nWhat it is: CVE-2026-43634 is a high-severity authentication bypass vulnerability in hestiacp, published on 19 May 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-2026-43634 exists.\n\nAffected product: hestiacp. 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-2026-43634/ (Markdown: https://insights.sbomify.com/CVE-2026-43634/index.md)","id":"CVE-2026-43634","markdown":"https://insights.sbomify.com/CVE-2026-43634/index.md","name":"CVE-2026-43634","record":{"aliases":["GHSA-72fg-f46j-5gvp"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["security_bypass","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"HestiaCP control panel","requires_auth":"none","summary":"Unauthenticated attackers can bypass authentication controls and fail2ban protections by spoofing IP addresses via the CF-Connecting-IP header.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-348","name":"Use of Less Trusted Source"}],"description":"HestiaCP versions 1.2.0 through 1.9.4 contain an IP spoofing vulnerability that allows unauthenticated remote attackers to bypass authentication security controls by supplying an arbitrary IP address in the CF-Connecting-IP HTTP header without verifying the request originated from Cloudflare's network. Attackers can exploit this to circumvent fail2ban brute-force protection, bypass per-user IP allowlists, and poison authentication audit logs by spoofing trusted IP addresses on each request.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"HestiaCP 1.2.0-1.9.4 IP Spoofing via CF-Connecting-IP Header","id":"CVE-2026-43634","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.","id":"CVE-2026-43635"},"packages":[],"prev":{"headline":"HestiaCP 1.9.0-1.9.4 Deserialization RCE via Web Terminal","id":"CVE-2026-43633"},"products":["hestiacp"],"published":"2026-05-19","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"partial"},"state":"PUBLISHED","updated":"2026-07-14","vendors":["hestiacp"]},"summary":"Unauthenticated attackers can bypass authentication controls and fail2ban protections by spoofing IP addresses via the CF-Connecting-IP header.","url":"https://insights.sbomify.com/CVE-2026-43634/"}