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CVE-2026-42898: Improper control of generation of code ('code injection') in Microsoft Dynamics 365 (on-premises) allows an au

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CRITICAL 9.9WATCHLISTUPGRADE

CVE-2026-42898 is a critical-severity flaw (CVSS 9.9) 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 score9.9 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance1.2% (top 32%)
CISA exploited listNo
WeaknessCWE-94
Published2026-05-12
Last modified2026-10-26
Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

microsoft dynamics 365 UPGRADE
Affected: >= 9.1.1.914 and < 9.1.45.11
Fixed in: 9.1.45.11
Safe to downgrade to: a release before 9.1.1.914
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 9.1.1.914 (Debian / Ubuntu)
apt-cache madison dynamics-365 sudo apt install dynamics-365=<VERSION_BEFORE_9.1.1.914> 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_9.1.1.914> 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.

Exact fixes by distribution

Fedora ELN · xfsdump · FIXED · 3.3.0-3.eln159 · FEDORA-2026-6e9bb3f901 · source
sudo dnf upgrade --advisory=FEDORA-2026-6e9bb3f901
Fedora 46 · fio · FIXED · 3.43-2.fc46 · FEDORA-2026-b36219886b · source
sudo dnf upgrade --advisory=FEDORA-2026-b36219886b
Microsoft Dynamics 365 (on-premises) version 9.1 · KB5078943 · FIXED · 9.1.45.11 · KB5078943 · source
Install KB5078943 via Windows Update, then verify: Get-HotFix -Id KB5078943
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-2026-42898?

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

Is CVE-2026-42898 being exploited?

CVE-2026-42898 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-2026-42898 affect?

CVE-2026-42898 affects dynamics 365. Severity is critical (CVSS 9.9). 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-2026-42898?

Priority 57/100. Critical severity; On your watchlist

Related CVEs

References

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