Vulnerability · Published Jul 7, 2026 · Assigned by GitHub_M

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

Critical 9.1

In plain English

A critical-severity security flaw in coder from coder. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.3%top 75.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/coder/coder	no fix listed	GO-2026-5196
Go	github.com/coder/coder	no fix listed	GHSA-6x44-w3xg-hqqf
Go	github.com/coder/coder/v2	2.31.12	GHSA-6x44-w3xg-hqqf
Go	github.com/coder/coder/v2	2.30.8	GHSA-6x44-w3xg-hqqf
Go	github.com/coder/coder/v2	2.29.13	GHSA-6x44-w3xg-hqqf
Go	github.com/coder/coder/v2	2.24.5	GHSA-6x44-w3xg-hqqf
Go	github.com/coder/coder/v2	2.33.3	GHSA-6x44-w3xg-hqqf
Go	github.com/coder/coder/v2	2.24.5, 2.29.13, 2.30.8, 2.31.12, 2.32.2, 2.33.3	GO-2026-5196
Go	github.com/coder/coder/v2	2.32.2	GHSA-6x44-w3xg-hqqf

Affected products (as reported)

Vendor	Product	Versions
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

Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

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