CVE-2026-12646: A Missing Authorization vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote authenticated a

This month

CRITICAL 9.9DOWNGRADE

CVE-2026-12646 is a critical-severity flaw (CVSS 9.9) affecting neurons for itsm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Missing Authorization vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote authenticated attacker to execute arbitrary code on the server.

Why this priority

Critical severity

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

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-09-08
Last modified	2026-09-18

Publisher (CNA): ivanti · Vendor: ivanti

Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 15:18 UTCPublished CVE record published
2026-09-18 18:15 UTCUpdated Record last modified

ivanti neurons for itsm DOWNGRADE

Affected: 2025.2 · 2025.3 · 2025.4 · 2026.1 · 2026.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 2025.2

1. Check installed version

apt-cache policy neurons-for-itsm || rpm -q neurons-for-itsm || neurons-for-itsm --version

2. No fixed release: DOWNGRADE to a release before 2025.2 (Debian / Ubuntu)

apt-cache madison neurons-for-itsm sudo apt install neurons-for-itsm=<VERSION_BEFORE_2025.2> sudo apt-mark hold neurons-for-itsm

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

dnf --showduplicates list neurons-for-itsm sudo dnf downgrade neurons-for-itsm-<VERSION_BEFORE_2025.2> sudo dnf versionlock add neurons-for-itsm

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-2026-12646?

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

Is CVE-2026-12646 being exploited?

CVE-2026-12646 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-2026-12646 affect?

CVE-2026-12646 affects neurons for itsm. Severity is critical (CVSS 9.9). A Missing Authorization vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote authenticated attacker to execute arbitrary code on the server.

How urgent is CVE-2026-12646?

Priority 53/100. Critical severity

Software pages

Ivanti vulnerabilities

Related CVEs

CVE-2026-12645 CRITICAL 9.9 DOWNGRADE A Missing Authorization vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote authenticated a
CVE-2026-12647 CRITICAL 9.9 DOWNGRADE A Missing Authorization vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote authenticated a
CVE-2026-12650 CRITICAL 9.9 DOWNGRADE A Deserialization of Untrusted Data vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote aut
CVE-2026-12648 HIGH 8.8 DOWNGRADE A Deserialization of Untrusted Data vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote aut
CVE-2026-12651 HIGH 8.8 DOWNGRADE A Deserialization of Untrusted Data vulnerability in Ivanti Neurons for ITSM before 2026.2 allows a remote aut

References

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