CVE-2026-0234Network attack vector

Unauthenticated resource access and modification via signature bypass

Published Apr 13, 2026 · Updated Apr 13, 2026

Improper signature verification in Cortex XSOAR and XSIAM Teams integrations 1.5.0 through 1.5.51 allows remote attackers to alter resources. Palo Alto Networks has not published the request field, verification routine, or signature-validation error that permits forged input. Exploitation requires a network-reachable Teams messaging endpoint and no authentication, exposing protected data to both disclosure and modification.

CVSS severityUnavailable
Unscored
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in Cortex XSOAR and XSIAM Teams integrations 1.5.0 through 1.5.51 allows remote attackers to alter resources. Palo Alto Networks has not published the request field, verification routine, or signature-validation error that permits forged input. Exploitation requires a network-reachable Teams messaging endpoint and no authentication, exposing protected data to both disclosure and modification.

The record

CVE
CVE-2026-0234
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
Palo Alto Networks
Product
Cortex XSIAM Microsoft Teams Marketplace
Classifications
CWE-347, CAPEC-475
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.5.0 <1.5.52 changes=[{"at":"1.5.52","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Palo Alto Networks · Cortex XSIAM Microsoft Teams Marketplaceversion=1.5.0 <1.5.52 changes=[{"at":"1.5.52","status":"unaffected"}]
Palo Alto Networks · Cortex XSOAR Microsoft Teams Marketplaceversion=1.5.0 <1.5.52 changes=[{"at":"1.5.52","status":"unaffected"}]

Published CVSS scores

7.2Palo Alto NetworksCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
CAPEC-475Signature Spoofing by Improper Validation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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