{"cve":"CVE-2026-63443","nvd":{"published":"2026-09-15T17:17:23.567","modified":"2026-09-30T17:51:36.337","status":"Awaiting Analysis","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","score":8.3},"cwes":["CWE-863","CWE-918"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-63443","score":0.00762,"percentile":0.55081,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-qrwj-vh9x-gw5v","url":"https://osv.dev/vulnerability/GHSA-qrwj-vh9x-gw5v","summary":"Coder's workspace agent API insecure redirect handling allowed cross-agent file read and write","modified":"2026-09-16T03:55:37.481979469Z","packages":[{"ecosystem":"Go","name":"github.com/coder/coder/v2","purl":"pkg:golang/github.com/coder/coder/v2","ranges":[">=2.34.0 <2.34.4"],"fixed":["2.34.4"]},{"ecosystem":"Go","name":"github.com/coder/coder/v2","purl":"pkg:golang/github.com/coder/coder/v2","ranges":[">=2.33.0 <2.33.10"],"fixed":["2.33.10"]},{"ecosystem":"Go","name":"github.com/coder/coder/v2","purl":"pkg:golang/github.com/coder/coder/v2","ranges":[">=2.30.0 <2.32.9"],"fixed":["2.32.9"]},{"ecosystem":"Go","name":"github.com/coder/coder/v2","purl":"pkg:golang/github.com/coder/coder/v2","ranges":[">=2.27.0 <2.29.19"],"fixed":["2.29.19"]}]},{"id":"GO-2026-5923","url":"https://osv.dev/vulnerability/GO-2026-5923","summary":"Coder's workspace agent API insecure redirect handling allowed cross-agent file read and write in github.com/coder/coder","modified":"2026-09-16T03:55:37.481979469Z","packages":[{"ecosystem":"Go","name":"github.com/coder/coder","purl":"pkg:golang/github.com/coder/coder","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/coder/coder/v2","purl":"pkg:golang/github.com/coder/coder/v2","ranges":[">=2.27.0 <2.29.19",">=2.30.0 <2.32.9",">=2.33.0 <2.33.10",">=2.34.0 <2.34.4"],"fixed":["2.29.19","2.32.9","2.33.10","2.34.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}