CVE-2026-71555
PILOS: Reverse tabnabbing in room description
- State
- Published
- Severity
- 4.1 Medium
- Published
- Aug 6, 2026
- Updated
- Aug 7, 2026
- Reserved
- Aug 6, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.1 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N | GitHub_M |
Weaknesses
- CWE-1022 Use of Web Link to Untrusted Target with window.opener Access
Affected Products
| Product | Versions |
|---|---|
PILOSTHM-Health |
|
References
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