CVE-2026-0234: An improper verification of cryptographic signature vulnerability exists in Cortex XSOAR and Cortex XSIAM plat

This month

CRITICAL 9.1REMOTEUPGRADEUPGRADE

CVE-2026-0234 is a critical-severity flaw (CVSS 9.1) affecting cortex xsiam, cortex xsoar. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An improper verification of cryptographic signature vulnerability exists in Cortex XSOAR and Cortex XSIAM platforms during integration of Microsoft Teams that enables an unauthenticated user to access and modify protected resources.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-04-13
Last modified	2026-10-26

Publisher (CNA): Palo Alto Networks, Inc. · Vendor: paloaltonetworks

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

Am I affected?

Timeline

2026-04-13 08:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

paloaltonetworks cortex xsiam UPGRADE

Affected: >= 1.5.0 and < 1.5.52

Fixed in: 1.5.52

Safe to downgrade to: a release before 1.5.0

1. Check installed version

apt-cache policy cortex-xsiam || rpm -q cortex-xsiam || cortex-xsiam --version

2. UPGRADE to 1.5.52 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cortex-xsiam

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cortex-xsiam

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 1.5.0 (Debian / Ubuntu)

apt-cache madison cortex-xsiam sudo apt install cortex-xsiam=<VERSION_BEFORE_1.5.0> sudo apt-mark hold cortex-xsiam

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

dnf --showduplicates list cortex-xsiam sudo dnf downgrade cortex-xsiam-<VERSION_BEFORE_1.5.0> sudo dnf versionlock add cortex-xsiam

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.

paloaltonetworks cortex xsoar UPGRADE

Affected: >= 1.5.0 and < 1.5.52

Fixed in: 1.5.52

Safe to downgrade to: a release before 1.5.0

1. Check installed version

apt-cache policy cortex-xsoar || rpm -q cortex-xsoar || cortex-xsoar --version

2. UPGRADE to 1.5.52 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cortex-xsoar

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cortex-xsoar

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 1.5.0 (Debian / Ubuntu)

apt-cache madison cortex-xsoar sudo apt install cortex-xsoar=<VERSION_BEFORE_1.5.0> sudo apt-mark hold cortex-xsoar

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

dnf --showduplicates list cortex-xsoar sudo dnf downgrade cortex-xsoar-<VERSION_BEFORE_1.5.0> sudo dnf versionlock add cortex-xsoar

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-2026-0234?

cortex xsiam: upgrade to 1.5.52; cortex xsoar: upgrade to 1.5.52. Exact commands for each OS are on this page.

Is CVE-2026-0234 being exploited?

CVE-2026-0234 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-2026-0234 affect?

CVE-2026-0234 affects cortex xsiam, cortex xsoar. Severity is critical (CVSS 9.1). An improper verification of cryptographic signature vulnerability exists in Cortex XSOAR and Cortex XSIAM platforms during integration of Microsoft Teams that enables an unauthenticated user to access and modify protected resources.

How urgent is CVE-2026-0234?

Priority 40/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Microsoft Teams vulnerabilities

References

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