CVE-2026-9152Network attack vector

Cross-tenant index access via unauthenticated SOAP operations

Published May 21, 2026 · Updated May 21, 2026

Missing authentication in Altium 365 SearchService allows remote attackers to read and alter cross-tenant search indexes via SOAP requests. The legacy endpoint executes search index operations without checking credentials, session tokens, or identity against the supplied workspace identifier. Possession of a target workspace identifier is sufficient; access is limited to indexed content and index entries, not underlying vault data.

CVSS severity10.0
Critical
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Altium 365 SearchService allows remote attackers to read and alter cross-tenant search indexes via SOAP requests. The legacy endpoint executes search index operations without checking credentials, session tokens, or identity against the supplied workspace identifier. Possession of a target workspace identifier is sufficient; access is limited to indexed content and index entries, not underlying vault data.

The record

CVE
CVE-2026-9152
Published
May 21, 2026
Updated
May 21, 2026
Vendor
Altium
Product
Altium 365
Classifications
CWE-306, CWE-639, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2026CVE publishedPublication date reported by the CVE source.
  2. May 21, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Altium · Altium 365Affected versions are unavailable in this record.

Published CVSS scores

10.0AltiumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-639Authorization Bypass Through User-Controlled Key
T1190Exploit Public-Facing Application

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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