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CVE PROGRAM SOURCE RECORD9.1 Critical

CVE-2026-46354

Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

Coder allows organizations to provision remote development environments via Terraform. In versions prior tp 2.24.5, 2.29.13, 2.30.8, 2.31.12, 2.32.2, and 2.33.3, `azureidentity.Validate()` verifies that the PKCS#7 signer certificate chains to a trusted Azure CA but never verifies the PKCS#7 signature itself. An attacker can embed a legitimate Azure certificate alongside arbitrary content e.g. `{"vmId":"<target>"}` and the forged `vmId` will be accepted returning the victim workspace agent's session token. No authentication is required. The attacker only needs to know a target VM's `vmId` which is a `UUIDv4`. That's a practical limitation which would typically require prior access to be exploited. Versions 2.24.5, 2.29.13, 2.30.8, 2.31.12, 2.32.2, and 2.33.3 patch the issue. As a workaround, reconfigure any Azure templates to use token authentication rather than `azure-instance-identity`.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

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  • >= 2.33.0-rc.0, < 2.33.3affected
  • >= 2.32.0-rc.0, < 2.32.2affected
  • >= 2.31.0, < 2.31.12affected
  • >= 2.30.0, < 2.30.8affected
  • >= 2.29.0, < 2.29.13affected
  • < 2.24.5affected

References