CVE-2026-46354 - Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft

CVE-2026-46354 - Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft

https://cvefeed.io/rssfeed/latest.atom / Wed, 07/08/2026 - 01:04
CVE ID :CVE-2026-46354
Published : July 7, 2026, 10:16 p.m. | 28 minutes ago
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":""}` 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`.
Severity: 9.1 | CRITICAL
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