{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-84831 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-84831 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-84831 is a high-severity authentication bypass vulnerability in SEPPmail Secure Email Gateway (SEG), published on 3 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-84831 and fix it if it is affected.\n\nWhat it is: CVE-2026-84831 is a high-severity authentication bypass vulnerability in SEPPmail Secure Email Gateway (SEG), published on 3 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-84831 in the wild and no public exploit code.\n\nAffected product: SEPPmail Secure Email Gateway (SEG). 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-2026-84831/ (Markdown: https://insights.sbomify.com/CVE-2026-84831/index.md)","id":"CVE-2026-84831","markdown":"https://insights.sbomify.com/CVE-2026-84831/index.md","name":"CVE-2026-84831","record":{"aliases":["GHSA-4fw6-qxc4-gqgq"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["account_takeover","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Secure Email Gateway","requires_auth":"low_privilege","summary":"Attackers with valid passwords for unenrolled MFA accounts can bypass second-factor authentication and access privileged functionality in SEPPmail Secure Email Gateway.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"NCSC.ch","cpe":[],"cvss":{"score":7.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"},{"id":"CWE-287","name":"Improper Authentication"}],"description":"SEPPmail Secure Email Gateway before 15.0.7 creates a fully privileged session before required multi-factor authentication enrollment is completed. An attacker with the password for an MFA-required but unenrolled account can access protected functionality without providing a second factor.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Mandatory MFA bypass before enrollment","id":"CVE-2026-84831","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Unsafe deserialization in the REST interface","id":"CVE-2026-84832"},"packages":[],"prev":{"headline":"OS command injection in privileged configuration handling","id":"CVE-2026-84830"},"products":["SEPPmail Secure Email Gateway (SEG)"],"published":"2026-09-03","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":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["SEPPmail AG"]},"summary":"Attackers with valid passwords for unenrolled MFA accounts can bypass second-factor authentication and access privileged functionality in SEPPmail Secure Email Gateway.","url":"https://insights.sbomify.com/CVE-2026-84831/"}