What is CVE-2026-0234?

CVE-2026-0234 is a critical-severity vulnerability in Palo Alto Networks Cortex Xsiam Microsoft Teams Marketplace, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.1/10. Published 2026-04-13.

How severe is CVE-2026-0234?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Palo Alto Networks Cortex Xsiam Microsoft Teams Marketplace

CVE-2026-0234

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.

Published 2026-04-13 · last modified 2026-07-07.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.002 (12.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Palo Alto Networks Cortex Xsiam Microsoft Teams Marketplace — versions 1.5.0
Palo Alto Networks Cortex Xsoar Microsoft Teams Marketplace — versions 1.5.0
Paloaltonetworks Cortex Xsiam
Paloaltonetworks Cortex Xsoar

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

security.paloaltonetworks.com/CVE-2026-0234 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-0234?: CVE-2026-0234 is a critical-severity vulnerability in Palo Alto Networks Cortex Xsiam Microsoft Teams Marketplace, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.1/10. Published 2026-04-13.
How severe is CVE-2026-0234?: Critical severity. CVSS v3 base score is 9.1 out of 10.