{"id":"CVE-2026-71555","aliases":["EUVD-2026-54178","GHSA-j4wr-p8gh-xrw5"],"status":"published","title":"PILOS: Reverse tabnabbing in room description","description":"PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. From 2.1.0 until 4.14.1, PILOS does not send a Cross-Origin-Opener-Policy response header, so pages opened by PILOS via a link that opens a new browsing context (e.g., target=\"_blank\") retain a window.opener reference back to the originating PILOS tab. A malicious destination page reached this way can use window.opener to navigate or manipulate the original PILOS tab, a technique known as reverse tabnabbing, potentially redirecting an authenticated user to a phishing page that mimics PILOS. This issue is fixed in version 4.14.1.","severity":{"version":"3.1","score":4.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00293,"percentile":0.22135,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1022"],"published":"2026-08-06T21:51:55Z","modified":"2026-10-28T02:30:34Z","products":[{"vendor":"thm-health","product":"pilos"}],"references":[{"url":"https://github.com/THM-Health/PILOS/security/advisories/GHSA-j4wr-p8gh-xrw5","tags":["x_refsource_CONFIRM","advisory"]},{"url":"https://github.com/THM-Health/PILOS/commit/b50f2bd07c4f4a7d6a9981578238ae3579275d81","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/THM-Health/PILOS/releases/tag/v4.14.1","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71555.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71555","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-71555","title":"PILOS: Reverse tabnabbing in room description","description":"PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. From 2.1.0 until 4.14.1, PILOS does not send a Cross-Origin-Opener-Policy response header, so pages opened by PILOS via a link that opens a new browsing context (e.g., target=\"_blank\") retain a window.opener reference back to the originating PILOS tab. A malicious destination page reached this way can use window.opener to navigate or manipulate the original PILOS tab, a technique known as reverse tabnabbing, potentially redirecting an authenticated user to a phishing page that mimics PILOS. This issue is fixed in version 4.14.1.","status":"published","published":"2026-08-06T21:51:55.89Z","modified":"2026-08-07T17:26:58.575Z","cvss":[{"version":"3.1","score":4.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-1022"],"updated_at":"2026-11-02T14:19:49.559463Z"}],"euvd":[{"id":"EUVD-2026-54178","description":"PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. From 2.1.0 until 4.14.1, PILOS does not send a Cross-Origin-Opener-Policy response header, so pages opened by PILOS via a link that opens a new browsing context (e.g., target=\"_blank\") retain a window.opener reference back to the originating PILOS tab. A malicious destination page reached this way can use window.opener to navigate or manipulate the original PILOS tab, a technique known as reverse tabnabbing, potentially redirecting an authenticated user to a phishing page that mimics PILOS. This issue is fixed in version 4.14.1.","status":"published","published":"2026-08-06T21:51:55Z","modified":"2026-08-07T17:26:58Z","cvss":[{"version":"3.1","score":4.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T18:02:06.930016Z"}],"nvd":[{"id":"CVE-2026-71555","description":"PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. From 2.1.0 until 4.14.1, PILOS does not send a Cross-Origin-Opener-Policy response header, so pages opened by PILOS via a link that opens a new browsing context (e.g., target=\"_blank\") retain a window.opener reference back to the originating PILOS tab. A malicious destination page reached this way can use window.opener to navigate or manipulate the original PILOS tab, a technique known as reverse tabnabbing, potentially redirecting an authenticated user to a phishing page that mimics PILOS. This issue is fixed in version 4.14.1.","status":"published","published":"2026-08-06T22:18:32.553Z","modified":"2026-10-24T15:10:00.19Z","cvss":[{"version":"3.1","score":4.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-1022"],"updated_at":"2026-11-02T14:12:35.386166Z"}],"osv":[{"id":"CVE-2026-71555","title":"PILOS: Reverse tabnabbing in room description","description":"PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. From 2.1.0 until 4.14.1, PILOS does not send a Cross-Origin-Opener-Policy response header, so pages opened by PILOS via a link that opens a new browsing context (e.g., target=\"_blank\") retain a window.opener reference back to the originating PILOS tab. A malicious destination page reached this way can use window.opener to navigate or manipulate the original PILOS tab, a technique known as reverse tabnabbing, potentially redirecting an authenticated user to a phishing page that mimics PILOS. This issue is fixed in version 4.14.1.","status":"published","published":"2026-08-06T21:51:55.89Z","modified":"2026-10-28T02:30:34.367459846Z","cvss":[{"version":"3.1","score":4.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-1022"],"updated_at":"2026-11-02T15:45:15.511448Z"}]}}