{"id":"CVE-2026-55168","aliases":["EUVD-2026-64143","GHSA-wcrf-g9p9-2wg7"],"status":"published","title":"Runtipi: Authenticated arbitrary file write via backup restore symlink planting","description":"Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00609,"percentile":0.49605,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-59","CWE-61"],"published":"2026-08-21T20:31:38Z","modified":"2026-10-28T02:31:13Z","exploits":[{"source":"pocgithub","id":"KovachVL/CVE-2026-55168","title":"KovachVL/CVE-2026-55168","date":"2026-06-16","url":"https://github.com/KovachVL/CVE-2026-55168"}],"products":[{"vendor":"runtipi","product":"runtipi"}],"references":[{"url":"https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7","tags":["x_refsource_CONFIRM","exploit","advisory"]},{"url":"https://github.com/runtipi/runtipi/pull/2606","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/runtipi/runtipi/commit/df529a211b05f3a0007b209b6c337f8c1942619c","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/runtipi/runtipi/releases/tag/v4.10.1","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55168.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55168","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-55168","title":"Runtipi: Authenticated arbitrary file write via backup restore symlink planting","description":"Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1.","status":"published","published":"2026-08-21T20:31:38.124Z","modified":"2026-08-25T17:01:52.501Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-59","CWE-61"],"updated_at":"2026-11-02T14:20:11.925815Z"}],"euvd":[{"id":"EUVD-2026-64143","description":"Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1.","status":"published","published":"2026-08-21T20:31:38Z","modified":"2026-08-25T17:01:52Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","level":"medium"}],"updated_at":"2026-11-02T18:01:32.513581Z"}],"nvd":[{"id":"CVE-2026-55168","description":"Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1.","status":"published","published":"2026-08-21T21:17:00.41Z","modified":"2026-10-14T19:10:00.297Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-59","CWE-61"],"updated_at":"2026-11-02T14:12:40.665005Z"}],"osv":[{"id":"CVE-2026-55168","title":"Runtipi: Authenticated arbitrary file write via backup restore symlink planting","description":"Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1.","status":"published","published":"2026-08-21T20:31:38.124Z","modified":"2026-10-28T02:31:13.042619529Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H","level":"medium"}],"cwes":["CWE-59","CWE-61"],"updated_at":"2026-11-02T15:45:11.22012Z"}]}}