CVE-2026-46354: Coder vulnerability (CVSS 9.1)

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`.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Affected products

Coder≥ 2.29.0 < 2.29.13 · ≥ 2.30.0 < 2.30.8 · ≥ 2.31.0 < 2.31.12 · ≥ 2.32.0 < 2.32.2

Remediation

Fixed in

Coder≥ 2.29.13

Patch & vendor advisories

References

https://github.com/coder/coder/pull/25286Issue TrackingPatch
https://github.com/coder/coder/releases/tag/v2.24.5Release Notes
https://github.com/coder/coder/releases/tag/v2.29.13Release Notes
https://github.com/coder/coder/releases/tag/v2.30.8Release Notes
https://github.com/coder/coder/releases/tag/v2.31.12Release Notes
https://github.com/coder/coder/releases/tag/v2.32.2Release Notes
https://github.com/coder/coder/releases/tag/v2.33.3Release Notes
https://github.com/coder/coder/security/advisories/GHSA-6x44-w3xg-hqqfPatchVendor Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-46354 being actively exploited?

CVE-2026-46354 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.32%.

How severe is CVE-2026-46354?

CVE-2026-46354 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.32% probability of exploitation.

Which products are affected by CVE-2026-46354?

Affected products include Coder.

How do I fix CVE-2026-46354?

Upgrade affected software to a fixed version, for example Coder 2.29.13 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-46354 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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