PILOS: Reverse tabnabbing in room description

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-71555
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-06 22:18:32 UTC
Updated2026-08-06 22:18:32 UTC
DescriptionPILOS (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.

Risk And Classification

Primary CVSS: v3.1 4.1 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

Problem Types: CWE-1022 | CWE-1022 CWE-1022: Use of Web Link to Untrusted Target with window.opener Access

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
3.1CNADECLARED4.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA THM-Health PILOS affected >= 2.1.0, < 4.14.1 Not specified

References

ReferenceSourceLinkTags
github.com/THM-Health/PILOS/releases/tag/v4.14.1 [email protected] github.com
github.com/THM-Health/PILOS/commit/b50f2bd07c4f4a7d6a9981578238ae3579275d81 [email protected] github.com
github.com/THM-Health/PILOS/security/advisories/GHSA-j4wr-p8gh-xrw5 [email protected] github.com
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