CVE-2026-42833: Improper control of generation of code ('code injection') in Microsoft Dynamics 365 (on-premises) allows an au

This month

CRITICAL 9.1WATCHLISTUPGRADE

CVE-2026-42833 is a critical-severity flaw (CVSS 9.1) affecting dynamics 365. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper control of generation of code ('code injection') in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to execute code over a network.

Why this priority

Critical severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-250
Published	2026-05-12
Last modified	2026-10-26

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 18:17 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

microsoft dynamics 365 UPGRADE

Affected: >= 9.1 and < 9.1.45.11

Fixed in: 9.1.45.11

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 9.1.45.11 (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-2026-42833?

dynamics 365: upgrade to 9.1.45.11. Exact commands for each OS are on this page.

Is CVE-2026-42833 being exploited?

CVE-2026-42833 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-2026-42833 affect?

CVE-2026-42833 affects dynamics 365. Severity is critical (CVSS 9.1). Improper control of generation of code ('code injection') in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to execute code over a network.

How urgent is CVE-2026-42833?

Priority 51/100. Critical severity; On your watchlist

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References

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