CVE-2026-58277: Improper authorization in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over

This month

HIGH 8.8WATCHLISTDOWNGRADE

CVE-2026-58277 is a high-severity flaw (CVSS 8.8) affecting sharepoint server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper authorization in Microsoft Office SharePoint allows an authorized attacker to elevate privileges 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	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-285
Published	2026-07-14
Last modified	2026-07-15

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-07-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-14 18:18 UTCPublished CVE record published
2026-07-15 15:13 UTCUpdated Record last modified

microsoft sharepoint server DOWNGRADE

Affected: 2016 · 2019

Fixed in: no fixed release known

Safe to downgrade to: a release before 2016

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 2016 (Debian / Ubuntu)

apt-cache madison sharepoint-server sudo apt install sharepoint-server=<VERSION_BEFORE_2016> 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_2016> 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.

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-2026-58277?

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

Is CVE-2026-58277 being exploited?

CVE-2026-58277 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-2026-58277 affect?

CVE-2026-58277 affects sharepoint server. Severity is high (CVSS 8.8). Improper authorization in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.

How urgent is CVE-2026-58277?

Priority 51/100. High severity; On your watchlist

Software pages

SharePoint vulnerabilities · Microsoft Office vulnerabilities

Related CVEs

CVE-2026-32201 MEDIUM 6.5 EXPLOITED UPGRADE Microsoft SharePoint Server Improper Input Validation Vulnerability
CVE-2026-20945 MEDIUM 4.6 UPGRADE Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office Share
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

References

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