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

Quick assessment

Affected
coder coder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Coder是Coder组织开源的一个可以在公共或私有云基础设施中设置开发环境的应用程序。 Coder存在加密问题漏洞，该漏洞源于azureidentity.Validate()函数仅验证PKCS#7签名者证书链到可信Azure CA，但未验证PKCS#7签名本身，攻击者可以嵌入合法Azure证书并伪造vmId，导致返回受害者工作区代理的会话令牌。以下版本受到影响：2.24.5之前版本、2.29.13之前版本、2.30.8之前版本、2.31.12之前版本、2.32.2之前版本和2.33.3之前版本。

CVSS 9.1 · Critical EPSS 0.32% · P22

Affected Version Matrix 6

VendorProduct Version RangeStatus
coder coder >= 2.33.0-rc.0, < 2.33.3 affected
>= 2.32.0-rc.0, < 2.32.2 affected
>= 2.31.0, < 2.31.12 affected
>= 2.30.0, < 2.30.8 affected
>= 2.29.0, < 2.29.13 affected
< 2.24.5 affected
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I. Basic Information for CVE-2026-46354

Vulnerability Information
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Vulnerability Title
Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft
Source: CVE Program / CVE List V5
Vulnerability 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`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Coder 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Coder是Coder组织开源的一个可以在公共或私有云基础设施中设置开发环境的应用程序。 Coder存在加密问题漏洞，该漏洞源于azureidentity.Validate()函数仅验证PKCS#7签名者证书链到可信Azure CA，但未验证PKCS#7签名本身，攻击者可以嵌入合法Azure证书并伪造vmId，导致返回受害者工作区代理的会话令牌。以下版本受到影响：2.24.5之前版本、2.29.13之前版本、2.30.8之前版本、2.31.12之前版本、2.32.2之前版本和2.33.3之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coder coder >= 2.33.0-rc.0, < 2.33.3 -

II. Public POCs for CVE-2026-46354

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III. Intelligence Information for CVE-2026-46354

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Patches & Fixes for CVE-2026-46354 (2)

Vendor Advisories for CVE-2026-46354 (1)

Vendor Pages for CVE-2026-46354 (4)

Other References for CVE-2026-46354 (1)

Same Patch Batch · coder · 2026-07-07 · 12 CVEs total

CVE-2026-55427 8.3 HIGH Coder vulnerable to SSH config injection via unsanitized server-supplied values in `coder
CVE-2026-55428 8.2 HIGH Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet
CVE-2026-44454 8.1 HIGH Coder vulnerable to workspace auto-creation via crafted URL parameters without user consen
CVE-2026-55075 7.4 HIGH Coder vulnerable to OIDC account takeover via email-based user matching and email_verified
CVE-2026-55076 7.4 HIGH Coder's OIDC email_verified type coercion bypass enables account takeover via unverified e
CVE-2026-55077 7.2 HIGH Coder: User-admin role can reset owner account password
CVE-2026-55434 6.5 MEDIUM Coder vulnerable to denial of service via unbounded request body in AI Bridge provider end
CVE-2026-45796 6.5 MEDIUM Coder vulnerable to unauthenticated SSRF via Azure Instance Identity Endpoint
CVE-2026-55078 6.5 MEDIUM Coder: Zip upload decompression lacks aggregate size limit, enabling denial of service
CVE-2026-55435 5.4 MEDIUM Suspended Coder users retain access to AI Bridge LLM proxy endpoints
CVE-2026-55079 4.9 MEDIUM Coder's unbounded memory allocation in provisioner file upload allows authenticated denial

IV. Related Vulnerabilities

Same product: coder
Same vendor: coder
Same weakness: CWE-347

V. Comments for CVE-2026-46354

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