PatchTheCVEoffice online server vulnerabilities and fixes
Recent CVEs affecting office online server, with upgrade or downgrade steps. 3 tracked.
Also searched as: officeonlineserver.
office online server has 3 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 3. Most recent: 2026-05-12. Highest priority: CVE-2026-40360 (score 41/100).
- 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 online server 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 online server being exploited right now?
None of the tracked office online server CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which office online server CVE should I patch first?
CVE-2026-40360 currently ranks highest (41/100): Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally..