CVE-2026-46354: Coder signature verification bypass in Azure instance identity validation

CVE-2026-46354 · Severity: critical · CVSS 9.1 · Published 2026-07-07

Coder, a platform for managing remote development environments, contains a security flaw in how it verifies Azure identities. An attacker can bypass security checks to impersonate a legitimate development workspace and obtain its session token. This could allow an unauthorized user to gain access to sensitive development environments and the data within them. Organizations using Azure-based templates are advised to update to a patched version or switch to token-based authentication.

Technologies: Coder, github.com/coder/coder (Go), github.com/coder/coder/v2 (Go). Vendors: Coder, Go.

Quick answers

Is CVE-2026-46354 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-46354 being exploited in the wild.
How severe is CVE-2026-46354?
Critical severity, with a CVSS score of 9.1, published 7 July 2026.
Which products and versions are affected?
Coder < 2.24.5, >= 2.29.0 < 2.29.13, >= 2.30.0 < 2.30.8, >= 2.31.0 < 2.31.12, >= 2.32.0 < 2.32.2, >= 2.33.0 < 2.33.3, < 2.24.5, 2.29.x < 2.29.13, 2.30.x < 2.30.8, 2.31.x < 2.31.12, 2.32.x < 2.32.2, 2.33.x < 2.33.3; github.com/coder/coder (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=0.27.3; github.com/coder/coder/v2 (Go) SEMVER:introduced=0,fixed=2.24.5,introduced=2.29.0,fixed=2.29.13,introduced=2.30.0,fixed=2.30.8,introduced=2.31.0,fixed=2.31.12,introduced=2.32.0-rc.0,fixed=2.32.2,introduced=2.33.0-rc.0,fixed=2.33.3, SEMVER:introduced=2.33.0-rc.0,fixed=2.33.3.
Is there a fix for CVE-2026-46354?
Yes. github.com/coder/coder/v2 (Go): upgrade to 2.33.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-46354 attacked?
It is attacked over the network, in a hosted service.
Am I affected by CVE-2026-46354?
Check whether you run Coder, github.com/coder/coder (Go) or github.com/coder/coder/v2 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/coder/coder/v2 (Go): upgrade to 2.33.3 or later
    go get github.com/coder/coder/v2@v2.33.3

Technical details

A vulnerability exists in Coder's `azureidentity.Validate()` function where it verifies that a PKCS#7 signer certificate chains to a trusted Azure CA but fails to verify the actual PKCS#7 signature. This allows a remote, unauthenticated attacker to provide a legitimate Azure certificate alongside a forged payload (such as a specific `vmId`). If the attacker knows the target's UUIDv4 `vmId`, they can successfully authenticate as that workspace and receive its session token. The issue is resolved by migrating to a library that correctly validates both the certificate chain and the signature. Patches are available in versions 2.24.5, 2.29.13, 2.30.8, 2.31.12, 2.32.2, and 2.33.3.

Affected products

  • Coder Coder < 2.24.5, >= 2.29.0 < 2.29.13, >= 2.30.0 < 2.30.8, >= 2.31.0 < 2.31.12, >= 2.32.0 < 2.32.2, >= 2.33.0 < 2.33.3

Identifiers

  • CVE-2026-46354
  • GHSA-6x44-w3xg-hqqf
  • GO-2026-5196

Timeline

  • 2026-05-13: patched: Fix merged and releases published
  • 2026-07-07: disclosed: CVE published to NVD

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.