CVE-2026-35383: Bentley Systems iTwin Platform exposed access token

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-02 · updated 2026-07-24
Weakness: CWE-540

Description

Bentley Systems iTwin Platform exposed a Cesium ion access token in the source of some web pages. An unauthenticated attacker could use this token to enumerate or delete certain assets. As of 2026-03-27, the token is no longer present in the web pages and cannot be used to enumerate or delete assets.

Affected products

Bentley Systems iTwin Platform: before 2026-03-27 — fixed in 2026-03-27

How to fix

Upgrade to a fixed version: Bentley Systems iTwin Platform 2026-03-27. Check the vendor advisory for mitigations.

References

https://cesium.com/learn/ion/cesium-ion-access-tokens/
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-092-01.json
https://www.cve.org/CVERecord?id=CVE-2026-35383

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