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Vulnerabilities CVE-2026-71555

CVE-2026-71555

Medium
Open
TLP:CLEAR

PILOS: Reverse tabnabbing in room description

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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.

Details

CVSS Score
4.1
EPSS Score
0.17%

6.4th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
Confidence
90%
Published
Aug 6, 2026
Last Modified
Aug 7, 2026
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