CVE-2025-62523: PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton

Q: How do I fix CVE-2025-62523?

pilos: upgrade to 4.8.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-62523 being exploited?

CVE-2025-62523 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-62523 affect?

CVE-2025-62523 affects pilos. Severity is medium (CVSS 6.3). PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. PILOS before 4.8.0 includes a Cross-Origin Resource Sharing (CORS) misconfiguration in its middleware: it reflects the Origin request header back in the

Q: How urgent is CVE-2025-62523?

Priority 25/100. No elevated risk signals yet.

Routine

MEDIUM 6.3UPGRADE

CVE-2025-62523 is a medium-severity flaw (CVSS 6.3) affecting pilos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. PILOS before 4.8.0 includes a Cross-Origin Resource Sharing (CORS) misconfiguration in its middleware: it reflects the Origin request header back in the Access-Control-Allow-Origin response header without proper validation or a whitelist, while Access-Control-Allow-Credentials is set to true. This behavior could allow a malicious website on a different origin t

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-942
Published	2025-10-27
Last modified	2026-10-08

Publisher (CNA): GitHub, Inc. · Vendor: thm

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-10-27 21:15 UTCPublished CVE record published
2026-10-08 11:10 UTCUpdated Record last modified

thm pilos UPGRADE

Affected: < 4.8.0

Fixed in: 4.8.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pilos || rpm -q pilos || pilos --version

2. UPGRADE to 4.8.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pilos

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pilos

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-62523?

pilos: upgrade to 4.8.0. Exact commands for each OS are on this page.

Is CVE-2025-62523 being exploited?

CVE-2025-62523 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-62523 affect?

CVE-2025-62523 affects pilos. Severity is medium (CVSS 6.3). PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton. PILOS before 4.8.0 includes a Cross-Origin Resource Sharing (CORS) misconfiguration in its middleware: it reflects the Origin request header back in the

How urgent is CVE-2025-62523?

Priority 25/100. No elevated risk signals yet.

Related CVEs

CVE-2025-62524 MEDIUM 5.3 UPGRADE PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton
CVE-2025-62781 MEDIUM 5.0 UPGRADE PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton
CVE-2026-22800 LOW 2.4 UPGRADE PILOS (Platform for Interactive Live-Online Seminars) is a frontend for BigBlueButton

References

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