critical

CVE-2026-46354

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

Published 7 Jul 2026Modified 8 Jul 2026CWE 347

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

GHSA9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Trivy's own label is CRITICAL. Rated critical by GHSA.

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 packages and fixed versions

Source	Package	Fixed in
go::GitHub Security Advisory Go	github.com/coder/coder, github.com/coder/coder/v2	2.33.3, 2.32.2, 2.31.12, 2.30.8, 2.29.13, 2.24.5

Show all 2 entries from 1 source

Source	Package	Fixed in
go::GitHub Security Advisory Go	github.com/coder/coder	no fix listed
go::GitHub Security Advisory Go	github.com/coder/coder/v2	2.33.3, 2.32.2, 2.31.12, 2.30.8, 2.29.13, 2.24.5

References

All 9 references

https://github.com/coder/coder/security/advisories/GHSA-6x44-w3xg-hqqf

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