CVE-2026-71555

mediumpriority · track · 0EPSS 0.003 · 21 %ileEU
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.29% (21st) EPSS
CVSS 4.1 · medium
Is it mine?
1 products
Check your exposure
Who says so?
2 sources
cnnvd · enisa_euvd

EPSS · scored 2026-10-24

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

4.1
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.8–4.1

v3.14.1mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:Nsecondary · ENISA EU
v3.14.1mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:Nsecondary · security-advisories@github.comexploitability 2.3 · impact 1.4
v3.13.8lowCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-1022US
04

affected products (1)

Products and version ranges known to be affected.

05

also known as (2)

Other names and identifiers for this entity.

06

sources

Which sources assert this record, and when.

cnnvdenisa_euvdNVDCVE.orgMITRE
published 2026-08-06modified 2026-10-24
07

references (9)

External citations — patches, advisories, analysis.

scry

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