PatchTheCVEoffice long term servicing channel vulnerabilities and fixes
Recent CVEs affecting office long term servicing channel, with upgrade or downgrade steps. 4 tracked.
Also searched as: officelongtermservicingchannel.
office long term servicing channel has 4 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 4. Most recent: 2026-05-12. Highest priority: CVE-2026-42831 (score 42/100).
- CVE-2026-42831 HIGH 7.8 UPGRADE DOWNGRADE Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
- CVE-2026-40360 HIGH 7.8 MITIGATE DOWNGRADE Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
- CVE-2026-40359 HIGH 7.8 MITIGATE DOWNGRADE Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
- CVE-2026-32197 HIGH 7.8 MITIGATE DOWNGRADE Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
FAQ
How do I fix office long term servicing channel vulnerabilities?
Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.
Is office long term servicing channel being exploited right now?
None of the tracked office long term servicing channel CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which office long term servicing channel CVE should I patch first?
CVE-2026-42831 currently ranks highest (42/100): Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally..