CVE-2026-97783: Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office Share

This month

HIGH 8.1WATCHLISTDOWNGRADE

CVE-2026-97783 is a high-severity flaw (CVSS 8.1) 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 unauthorized attacker to perform spoofing over a network.

Why this priority

High severity
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-10-13
Last modified	2026-10-21

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-13 19:22 UTCPublished CVE record published
2026-10-21 17:21 UTCUpdated Record last modified

microsoft sharepoint server DOWNGRADE

Affected: 2019

Fixed in: no fixed release known

Safe to downgrade to: a release before 2019

1. Check installed version

apt-cache policy sharepoint-server || rpm -q sharepoint-server || sharepoint-server --version

2. No fixed release: DOWNGRADE to a release before 2019 (Debian / Ubuntu)

apt-cache madison sharepoint-server sudo apt install sharepoint-server=<VERSION_BEFORE_2019> sudo apt-mark hold sharepoint-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list sharepoint-server sudo dnf downgrade sharepoint-server-<VERSION_BEFORE_2019> sudo dnf versionlock add sharepoint-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

Microsoft MSRC Update Guide: CVE-2026-97783 Microsoft Office SharePoint Spoofing Vulnerability 2026-10-21

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2026-97783?

sharepoint server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-97783 being exploited?

CVE-2026-97783 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-2026-97783 affect?

CVE-2026-97783 affects sharepoint server. Severity is high (CVSS 8.1). Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

How urgent is CVE-2026-97783?

Priority 44/100. High severity; On your watchlist

Software pages

SharePoint vulnerabilities · Microsoft Office vulnerabilities

Related CVEs

CVE-2026-33112 HIGH 8.8 UPGRADE Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code
CVE-2026-33110 HIGH 8.8 UPGRADE Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code
CVE-2026-35439 HIGH 8.8 UPGRADE Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code
CVE-2026-40357 HIGH 8.8 UPGRADE Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code
CVE-2026-40368 HIGH 8.0 UPGRADE Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code

References

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