How severe is CVE-2026-9152?

CVE-2026-9152 has a CVSS 4.0 base score of 10.0, rated critical severity.

Is CVE-2026-9152 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-9152?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-9152 have an EU (EUVD) identifier?

Yes. CVE-2026-9152 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31205.

When was CVE-2026-9152 published?

CVE-2026-9152 was published on 2026-05-21 and last updated on 2026-07-23.

CVE-2026-9152

CVE-2026-9152 is a critical-severity vulnerability with a CVSS 4.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 4.0 base score 10.0)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31205
Weakness: CWE-306
Published: 2026-05-21
Last modified: 2026-07-23

Description

A missing authentication vulnerability exists in the Altium 365 SearchService. A legacy SOAP endpoint exposes search index operations without requiring authentication, session tokens, or any form of identity verification. An unauthenticated network attacker who can reference a target workspace's identifier can interact with that workspace's search index, crossing tenant boundaries. Successful exploitation allows reading a workspace's indexed contents (such as component data, project and folder names, and user metadata) and injecting, modifying, or deleting search index entries. These operations affect the search index only, not the underlying vault data, but they can disclose sensitive workspace information and compromise the integrity and availability of search results. Altium 365 cloud deployments are affected; on-premise Altium Enterprise Server is not affected.

Frequently asked questions

What is CVE-2026-9152?: A missing authentication vulnerability exists in the Altium 365 SearchService. A legacy SOAP endpoint exposes search index operations without requiring authentication, session tokens, or any form of identity verification. An unauthenticated network attacker who can reference a target workspace's identifier can interact with that workspace's search index, crossing tenant boundaries. Successful exploitation allows reading a workspace's indexed contents (such as component data, project and folder names, and user metadata) and injecting, modifying, or deleting search index entries. These operations affect the search index only, not the underlying vault data, but they can disclose sensitive workspace information and compromise the integrity and availability of search results. Altium 365 cloud deployments are affected; on-premise Altium Enterprise Server is not affected.
How severe is CVE-2026-9152?: CVE-2026-9152 has a CVSS 4.0 base score of 10.0, rated critical severity.
Is CVE-2026-9152 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-9152?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-9152 have an EU (EUVD) identifier?: Yes. CVE-2026-9152 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31205.
When was CVE-2026-9152 published?: CVE-2026-9152 was published on 2026-05-21 and last updated on 2026-07-23.

References

https://www.altium.com/platform/security-compliance/security-advisories

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