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

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Summary

CVECVE-2026-46354
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-07 22:16:52 UTC
Updated2026-07-07 22:16:52 UTC
DescriptionCoder 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`.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

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

Problem Types: CWE-347 | CWE-347 CWE-347: Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Coder Coder affected >= 2.33.0-rc.0, < 2.33.3 Not specified
CNA Coder Coder affected >= 2.32.0-rc.0, < 2.32.2 Not specified
CNA Coder Coder affected >= 2.31.0, < 2.31.12 Not specified
CNA Coder Coder affected >= 2.30.0, < 2.30.8 Not specified
CNA Coder Coder affected >= 2.29.0, < 2.29.13 Not specified
CNA Coder Coder affected < 2.24.5 Not specified

References

ReferenceSourceLinkTags
github.com/coder/coder/security/advisories/GHSA-6x44-w3xg-hqqf [email protected] github.com
github.com/coder/coder/releases/tag/v2.29.13 [email protected] github.com
github.com/coder/coder/releases/tag/v2.31.12 [email protected] github.com
github.com/coder/coder/pull/25286 [email protected] github.com
github.com/coder/coder/releases/tag/v2.33.3 [email protected] github.com
github.com/coder/coder/releases/tag/v2.24.5 [email protected] github.com
github.com/coder/coder/releases/tag/v2.30.8 [email protected] github.com
github.com/coder/coder/releases/tag/v2.32.2 [email protected] github.com
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