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CVE-2026-71555— PILOS: Reverse tabnabbing in room description

Quick assessment

Affected
THM-Health PILOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

THM PILOS是THM组织开源的一款网络操作系统。 THM PILOS 2.1.0版本至4.14.1之前版本存在处理逻辑错误漏洞，该漏洞源于未发送Cross-Origin-Opener-Policy响应头，可能导致反向标签钓鱼攻击，将已验证用户重定向到模拟PILOS的钓鱼页面。

CVSS 4.1 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1566.002 · Spearphishing Link

Affected Version Matrix 1

VendorProduct Version RangeStatus
THM-Health PILOS >= 2.1.0, < 4.14.1 affected
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I. Basic Information for CVE-2026-71555

Vulnerability Information
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Vulnerability Title
PILOS: Reverse tabnabbing in room description
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用windows.opener访问指向不可信目标的web链接
Source: CVE Program / CVE List V5
Vulnerability Title
THM PILOS 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
THM PILOS是THM组织开源的一款网络操作系统。 THM PILOS 2.1.0版本至4.14.1之前版本存在处理逻辑错误漏洞，该漏洞源于未发送Cross-Origin-Opener-Policy响应头，可能导致反向标签钓鱼攻击，将已验证用户重定向到模拟PILOS的钓鱼页面。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
THM-Health PILOS >= 2.1.0, < 4.14.1 -

II. Public POCs for CVE-2026-71555

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III. Intelligence Information for CVE-2026-71555

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Vendor Advisories for CVE-2026-71555 (1)

IV. Related Vulnerabilities

Same product: PILOS
Same vendor: THM-Health
Same weakness: CWE-1022

V. Comments for CVE-2026-71555

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