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CVE-2026-63443— Coder: Workspace agent API insecure redirect handling allowed cross-agent file read and write

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 允许组织通过 Terraform 预配远程开发环境。在版本 2.29.19、2.32.9、2.33.10 和 2.34.4 之前， 在处理重定向时，其自定义传输层会接受来自重定向后请求 URL 的主机地址，前提是该请求端口为工作区 Agent 的 HTTP API 端口（端口 4）。 若一名已认证用户能够控制一个被篡改的工作区 Agent，并且知道另一个在线 Agent 的 UUID，则可以利用此漏洞推导出受害者的 tailnet 地址，并将控制平面请求重定向至该受害者 Agent。 具体而言： HTT

CVSS 8.3 · High
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I. Basic Information for CVE-2026-63443

Vulnerability Information
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Vulnerability Title
Coder: Workspace agent API insecure redirect handling allowed cross-agent file read and write
Source: CVE Program / CVE List V5
Vulnerability Description
Coder allows organizations to provision remote development environments via Terraform. Prior to 2.29.19, 2.32.9, 2.33.10, and 2.34.4, agentConn.apiClient() follows redirects while its custom transport accepts the host from the redirected request URL when the port is the workspace agent HTTP API port 4. An authenticated user who controls a modified workspace agent and knows another online agent's UUID can derive the victim's tailnet address and redirect control-plane requests to that agent. HTTP 301, 302, and 303 redirects can redirect read requests, while HTTP 307 and 308 preserve replayable write and process-start requests. The redirected workspace agent file APIs can read or write files as the victim workspace user, and affected versions exposing the workspace agent process API can execute commands after a redirected file write, crossing workspace and tenant boundaries. This issue is fixed in versions 2.29.19, 2.32.9, 2.33.10, and 2.34.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
coder coder >= 2.27.0, < 2.29.19 -

II. Public POCs for CVE-2026-63443

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III. Intelligence Information for CVE-2026-63443

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Patches & Fixes for CVE-2026-63443 (9)

Vendor Advisories for CVE-2026-63443 (1)

Vendor Pages for CVE-2026-63443 (4)

IV. Related Vulnerabilities

Same product: coder
Same vendor: coder
Same weakness: CWE-863

V. Comments for CVE-2026-63443

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