{"id":"CVE-2026-55431","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55431","generatedAt":"2026-10-28T02:13:24.357Z","title":"Coder allows organizations to provision remote development environments via Terraform.","description":"Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `coder open app` opens external workspace-app URLs without validating the scheme or host. When an external app URL contains the `$SESSION_TOKEN` placeholder the CLI replaces it with the user's real session token before handing the URL to the OS open handler. Practical exploitation requires the victim to run `coder open app` against a workspace whose external app definition the attacker controls. Only a malicious template author can control external app URLs. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 applies a URL-scheme allowlist in the CLI and limits `$SESSION_TOKEN` substitution to trusted destinations like the web frontend. As a workaround, avoid running `coder open app` for untrusted workspaces.","published":"2026-07-08T01:16:27.000Z","lastModified":"2026-07-08T19:42:46.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-522","CWE-601"],"affected":["coder/coder"],"epss":{"score":0.00336,"percentile":0.26803,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.34%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/coder/coder/pull/26146","tags":["Issue Tracking","Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/coder/coder/releases/tag/v2.29.17","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/coder/coder/releases/tag/v2.32.7","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/coder/coder/releases/tag/v2.33.8","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/coder/coder/releases/tag/v2.34.2","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/coder/coder/security/advisories/GHSA-v54h-cp2w-9x4g","tags":["Patch","Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55431","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}