CVE-2026-65772: Deserialization of untrusted data in Microsoft Dynamics 365 allows an authorized attacker to execute code over

This month

HIGH 8.8WATCHLISTUPGRADE

CVE-2026-65772 is a high-severity flaw (CVSS 8.8) affecting dynamics 365. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Deserialization of untrusted data in Microsoft Dynamics 365 allows an authorized attacker to execute code over a network.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-09-08
Last modified	2026-10-07

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 18:18 UTCPublished CVE record published
2026-10-07 14:32 UTCUpdated Record last modified

microsoft dynamics 365 UPGRADE

Affected: >= 9.1 and < 9.1.0046.0006

Fixed in: 9.1.0046.0006

Safe to downgrade to: a release before 9.1

1. Check installed version

apt-cache policy dynamics-365 || rpm -q dynamics-365 || dynamics-365 --version

2. UPGRADE to 9.1.0046.0006 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade dynamics-365

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade dynamics-365

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 9.1 (Debian / Ubuntu)

apt-cache madison dynamics-365 sudo apt install dynamics-365=<VERSION_BEFORE_9.1> sudo apt-mark hold dynamics-365

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list dynamics-365 sudo dnf downgrade dynamics-365-<VERSION_BEFORE_9.1> sudo dnf versionlock add dynamics-365

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-2026-65772?

dynamics 365: upgrade to 9.1.0046.0006. Exact commands for each OS are on this page.

Is CVE-2026-65772 being exploited?

CVE-2026-65772 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-2026-65772 affect?

CVE-2026-65772 affects dynamics 365. Severity is high (CVSS 8.8). Deserialization of untrusted data in Microsoft Dynamics 365 allows an authorized attacker to execute code over a network.

How urgent is CVE-2026-65772?

Priority 55/100. High severity; On your watchlist

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References

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