{"id":"CVE-2026-120005","kind":"vulnerability","aliases":["CVE-2026-120005"],"related":[],"title":"Microsoft PowerPoint: heap overflow lets an attacker run code over network","description":"Heap-based buffer overflow in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.","summary":"Heap-based buffer overflow in Microsoft Office PowerPoint lets an unauthorized attacker execute code. The CVSS vector (AV:N/AC:L/PR:N/UI:R) says it needs user interaction, most likely opening a crafted presentation, but the sources do not state the trigger. Published 2026-11-10, the same day as Microsoft's November 2026 Patch Tuesday. No exploitation or public PoC is reported.","severity":"high","cvss":8.8,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["microsoft-office","other","powerpoint","windows"],"not_affected_if":[],"how_to_check":"In PowerPoint, open File > Account > About PowerPoint and note the version/build. Compare it with the Microsoft Security Update Guide entry for CVE-2026-120005 (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-120005) and the Microsoft 365 Apps security updates page (https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates). Affected builds not confirmed yet.","fix":null,"status":"open","published_at":"2026-11-10T19:20:26+00:00","first_seen_at":"2026-11-10T19:25:07+00:00","triaged_at":"2026-11-10T19:27:54+00:00","updated_at":"2026-11-10T22:06:53+00:00","category":"other","confidence":0.4,"triage":{"at":"2026-11-10T19:27:54Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Microsoft PowerPoint: heap overflow lets an attacker run code over network","impact":"high","summary":"A heap-based buffer overflow in Microsoft Office PowerPoint lets an unauthorized attacker execute code over a network. The sources do not describe the exact triggering file or interaction.","audience":"everyone","category":"other","nicknames":[],"who_cares":["microsoft-office","powerpoint","windows"],"confidence":0.4,"fix_status":"unknown","needs_auth":"no","worst_case":"Attacker runs code on the victim's computer over the network.","analyst_note":"Confirm affected PowerPoint builds and the Microsoft security update guide entry for CVE-2026-120005, and whether opening a file is required.","how_to_check":"- Check the installed PowerPoint version in the Office application's About page; the affected versions are unknown from the sources.\n- unknown","plain_action":"Update Microsoft PowerPoint through Microsoft Office updates once Microsoft publishes a fix for CVE-2026-120005.","product_name":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"unknown","product_ecosystem":"","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000674,"input_tokens":4502,"output_tokens":447,"severity_before":"high"},"analyst_status":"done","analyst_note":"Confirm affected PowerPoint builds and the Microsoft security update guide entry for CVE-2026-120005, and whether opening a file is required.","search":"'-10':69B '-11':68B '-120005':14A,17A '-2026':13A,16A '2026':67B,77B 'allow':96C 'attack':7A,36B,99C 'av':42B 'base':26B,89C 'buffer':27B,90C 'code':9A,38B,102C 'craft':56B 'cve':12A,15A 'cvss':40B 'day':72B 'execut':37B,101C 'exploit':81B 'heap':3A,25B,88C 'heap-bas':24B,87C 'interact':51B 'l/pr':44B 'let':5A,33B 'like':53B 'microsoft':1A,19B,30B,74B,93C 'microsoft-offic':18B 'n/ac':43B 'n/ui':45B 'need':49B 'network':11A,105C 'novemb':76B 'offic':20B,31B,94C 'open':54B 'overflow':4A,28B,91C 'patch':78B 'poc':84B 'powerpoint':2A,22B,32B,95C 'present':57B 'public':83B 'publish':66B 'r':46B 'report':86B 'run':8A 'say':47B 'sourc':60B 'state':63B 'trigger':65B 'tuesday':79B 'unauthor':35B,98C 'user':50B 'vector':41B 'window':23B","nicknames":[],"mitigations":[],"who_affected":"Anyone running Microsoft PowerPoint (Microsoft 365 Apps, Office LTSC/2021/2024) who opens presentations from outside sources. Exact affected builds are not yet confirmed from Microsoft's own entry. Teams that never open untrusted PowerPoint files have lower exposure.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":"Update Microsoft PowerPoint through Microsoft Office updates once Microsoft publishes a fix for CVE-2026-120005.","pkeys":[],"ptokens":[],"labels":["high","microsoftoffice","other","powerpoint","windows"],"campaign_type":null,"search_a":"'-120005':14A,17A '-2026':13A,16A 'attack':7A 'code':9A 'cve':12A,15A 'heap':3A 'let':5A 'microsoft':1A 'network':11A 'overflow':4A 'powerpoint':2A 'run':8A","search_b":"'-10':69B '-11':68B '2026':67B,77B 'attack':36B 'av':42B 'base':26B 'buffer':27B 'code':38B 'craft':56B 'cvss':40B 'day':72B 'execut':37B 'exploit':81B 'heap':25B 'heap-bas':24B 'interact':51B 'l/pr':44B 'let':33B 'like':53B 'microsoft':19B,30B,74B 'microsoft-offic':18B 'n/ac':43B 'n/ui':45B 'need':49B 'novemb':76B 'offic':20B,31B 'open':54B 'overflow':28B 'patch':78B 'poc':84B 'powerpoint':22B,32B 'present':57B 'public':83B 'publish':66B 'r':46B 'report':86B 'say':47B 'sourc':60B 'state':63B 'trigger':65B 'tuesday':79B 'unauthor':35B 'user':50B 'vector':41B 'window':23B","search_c":"'allow':96C 'attack':99C 'base':89C 'buffer':90C 'code':102C 'execut':101C 'heap':88C 'heap-bas':87C 'microsoft':93C 'network':105C 'offic':94C 'overflow':91C 'powerpoint':95C 'unauthor':98C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:20:26+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-120005","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-120005","severity":null,"published_at":"2026-11-10T19:20:26+00:00","modified_at":"2026-11-10T19:20:26+00:00","first_seen_at":"2026-11-10T19:25:07+00:00","fetched_at":"2026-11-10T19:25:07+00:00","note":null},{"source":"analyst","external_id":"CVE-2026-120005:2920","url":"https://www.rapid7.com/db/vulnerabilities/cve-2026-120005/","severity":null,"published_at":"2026-11-10T22:06:53+00:00","modified_at":"2026-11-10T22:06:53+00:00","first_seen_at":"2026-11-10T22:06:53+00:00","fetched_at":"2026-11-10T22:06:53+00:00","note":"MSRC guide page not retrievable; only NVD/Rapid7 data. CVSS vector has UI:R (user must open/interact), 8.8. Possibly fixed in Nov 10 2026 Patch Tuesday but Microsoft's entry for this CVE not read, so fix and affected builds unknown; nothing verified.","cites":["https://www.rapid7.com/db/vulnerabilities/cve-2026-120005/"]}],"documents":[{"id":119385,"url":"https://www.rapid7.com/db/vulnerabilities/cve-2026-120005/","title":"Rapid7: CVE-2026-120005","kind":"other","source":"analyst","publisher":null,"text":null,"published_at":null,"relation":"describes","confidence":null,"note":null}],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}