SEPTEMBER 17, 2026
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Case File

CVE-2026-63443

HIGH · CVSS 8.3 EPSS 0.42% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-15 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

The vulnerability affects Coder's remote development environment provisioning via Terraform, where the agentConn.apiClient() improperly follows redirects, allowing an authenticated user with control over a modified workspace agent to exploit this behavior. This can lead to unauthorized access to a victim's tailnet address, enabling the attacker to redirect control-plane requests and execute commands or manipulate files as the victim user, potentially crossing workspace and tenant boundaries. Organizations using affected versions prior to 2.29.19, 2.32.9, 2.33.10, and 2.34.4 should prioritize patching to mitigate the risk of unauthorized access and command execution.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

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CVE
CVE-2026-63443
Severity
HIGH
CVSS
8.3
EPSS
0.42%

Original NVD 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.