PatchTheCVECVE-2026-20945: Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office Share
CVE-2026-20945 is a medium-severity flaw (CVSS 4.6) affecting sharepoint server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Why this priority
- EPSS top 3%: very likely to be exploited
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 4.6 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 19.1% (top 3%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2026-04-14 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-20945?
sharepoint server: upgrade to 16.0.19725.20210. Exact commands for each OS are on this page.
Is CVE-2026-20945 being exploited?
CVE-2026-20945 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-20945 affect?
CVE-2026-20945 affects sharepoint server. Severity is medium (CVSS 4.6). Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
How urgent is CVE-2026-20945?
Priority 45/100. EPSS top 3%: very likely to be exploited; On your watchlist
Software pages
SharePoint vulnerabilities · Microsoft Office vulnerabilities
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