---
title: "CVE-2026-46354: Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft"
url: https://erroneo.us/security/cve/CVE-2026-46354/
description: "CVE-2026-46354 (github.com/coder/coder/v2 (Go)): Coder allows organizations to provision remote development environments via Terraform. In versions prior tp…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-07
date_modified: 2026-07-08
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-46354"
kev: false
cvss: 9.1
epss: 0.00318
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.3% , percentile 23: FIRST’s model estimates a 0.3% chance of exploitation activity in the next 30 days, higher than 23% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/coder/coder/v2 (Go) >= 2.33.0-rc.0, < 2.33.3, fixed in 2.33.3 ; github.com/coder/coder/v2 (Go) >= 2.32.0-rc.0, < 2.32.2, fixed in 2.32.2 ; github.com/coder/coder/v2 (Go) >= 2.31.0, < 2.31.12, fixed in 2.31.12 ; github.com/coder/coder/v2 (Go) >= 2.30.0, < 2.30.8, fixed in 2.30.8 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Go `github.com/coder/coder/v2` >= 2.33.0-rc.0, < 2.33.3 → fixed: 2.33.3
- Go `github.com/coder/coder/v2` >= 2.32.0-rc.0, < 2.32.2 → fixed: 2.32.2
- Go `github.com/coder/coder/v2` >= 2.31.0, < 2.31.12 → fixed: 2.31.12
- Go `github.com/coder/coder/v2` >= 2.30.0, < 2.30.8 → fixed: 2.30.8
- Go `github.com/coder/coder/v2` >= 2.29.0, < 2.29.13 → fixed: 2.29.13
- Go `github.com/coder/coder/v2` < 2.24.5 → fixed: 2.24.5
- Go `github.com/coder/coder` <= 0.27.3 → fixed: none listed

## Affected products (CVE record)

- coder coder: >= 2.33.0-rc.0, < 2.33.3, >= 2.32.0-rc.0, < 2.32.2, >= 2.31.0, < 2.31.12, >= 2.30.0, < 2.30.8, >= 2.29.0, < 2.29.13, < 2.24.5

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.32% probability of exploitation activity in the next 30 days; percentile 23.

## Sources

- [GitHub Advisory GHSA-6x44-w3xg-hqqf](https://github.com/advisories/GHSA-6x44-w3xg-hqqf)
- [CVE.org record CVE-2026-46354](https://www.cve.org/CVERecord?id=CVE-2026-46354)
- [NVD entry CVE-2026-46354](https://nvd.nist.gov/vuln/detail/CVE-2026-46354)
- [github.com](https://github.com/coder/coder/security/advisories/GHSA-6x44-w3xg-hqqf)
- [github.com](https://github.com/coder/coder/pull/25286)
- [github.com](https://github.com/coder/coder/releases/tag/v2.24.5)
- [github.com](https://github.com/coder/coder/releases/tag/v2.29.13)
- [github.com](https://github.com/coder/coder/releases/tag/v2.30.8)
- [github.com](https://github.com/coder/coder/releases/tag/v2.31.12)
- [github.com](https://github.com/coder/coder/releases/tag/v2.32.2)
- [github.com](https://github.com/coder/coder/releases/tag/v2.33.3)

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Source page: https://erroneo.us/security/cve/CVE-2026-46354/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt