CVE-2026-71555
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 6% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1022 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-1583 | Medium | 6.5 | 1.3% | - | Fix |
| CVE-2021-39112 | Medium | 4.8 | 0.7% | - | Fix |
| CVE-2021-33697 | Medium | 6.1 | 0.6% | - | - |
| CVE-2020-36624 | Medium | 6.3 | 0.6% | - | Fix |
| CVE-2022-2600 | Medium | 5.4 | 0.5% | - | - |
| CVE-2018-25058 | Medium | 4.2 | 0.5% | - | Fix |
Common questions
How do I fix CVE-2026-71555?
No published fix for CVE-2026-71555 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-71555 being actively exploited?
Not that we know of. CVE-2026-71555 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.17% is the estimated probability that it will be exploited in the next 30 days. That is higher than 6% of all scored CVEs.
How severe is CVE-2026-71555?
CVE-2026-71555 has a CVSS v3 base score of 4.1, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-07.