CVE-2026-63443
Coder allows organizations to provision remote development environments via Terraform.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.76%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.3 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
- EPSS
- 0.76% probability · 55th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-863, CWE-918
- Source
- security-advisories@github.com
EPSS 0.8% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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/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/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
- https://github.com/coder/coder/security/advisories/GHSA-qrwj-vh9x-gw5v
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.