{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2026-66307 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-66307 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-66307 is a high-severity vulnerability in Microsoft Skype for Business Server 2015 CU13, published on 8 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-2026-66307 and fix it if it is affected.\n\nWhat it is: CVE-2026-66307 is a high-severity vulnerability in Microsoft Skype for Business Server 2015 CU13, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-66307 in the wild and no public exploit code.\n\nAffected product: Microsoft Skype for Business Server 2015 CU13. 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-2026-66307/ (Markdown: https://insights.sbomify.com/CVE-2026-66307/index.md)","id":"CVE-2026-66307","markdown":"https://insights.sbomify.com/CVE-2026-66307/index.md","name":"CVE-2026-66307","record":{"aliases":["GHSA-fmx2-865f-8c6j"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Skype for Business Server","requires_auth":"none","summary":"An integer underflow in Skype for Business Server allows an unauthorized attacker to cause a denial of service over the network.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"microsoft","cpe":[{"product":"skype_for_business_server","vendor":"microsoft"},{"product":"skype_for_business_server_subscription_edition","vendor":"microsoft"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","version":"3.1"},"cwes":[{"id":"CWE-191","name":"Integer Underflow (Wrap or Wraparound)"}],"description":"Integer underflow (wrap or wraparound) in Skype for Business allows an unauthorized attacker to deny service over a network.","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":"Skype for Business and Lync Denial of Service Vulnerability","id":"CVE-2026-66307","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"integer_overflow","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Skype for Business and Lync Denial of Service Vulnerability","id":"CVE-2026-66308"},"packages":[],"prev":{"headline":"Skype for Business Information Disclosure Vulnerability","id":"CVE-2026-66306"},"products":["Skype for Business Server 2015 CU13","Skype for Business Server 2019 CU8","Skype for Business Server Subscription Edition CU1"],"published":"2026-09-08","related":[{"cvss_score":5.3,"headline":"Microsoft Skype for Business Privilege Escalation","id":"CVE-2023-41763","kev_date_added":"2023-10-10","published":"2023-10-10"},{"cvss_score":9.8,"headline":"Skype for Business Remote Code Execution Vulnerability","id":"CVE-2026-66302","kev_date_added":null,"published":"2026-09-08"},{"cvss_score":8.3,"headline":"Skype for Business Spoofing Vulnerability","id":"CVE-2026-69646","kev_date_added":null,"published":"2026-09-08"},{"cvss_score":7.5,"headline":"Skype for Business Information Disclosure Vulnerability","id":"CVE-2026-66304","kev_date_added":null,"published":"2026-09-08"},{"cvss_score":7.2,"headline":"Skype for Business Remote Code Execution Vulnerability","id":"CVE-2023-36780","kev_date_added":null,"published":"2023-10-10"},{"cvss_score":7.2,"headline":"Skype for Business Remote Code Execution Vulnerability","id":"CVE-2023-36786","kev_date_added":null,"published":"2023-10-10"}],"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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-14","vendors":["Microsoft"]},"summary":"An integer underflow in Skype for Business Server allows an unauthorized attacker to cause a denial of service over the network.","url":"https://insights.sbomify.com/CVE-2026-66307/"}