Vulnerability in Thm Pilos
CVE-2025-62523
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 to send requests (including credentials) to the PILOS API. This may enable exfiltration or actions using the victim’s credentials if the server accepts those cross-origin requests as authenticated. Laravel’s session handling applies additional origin checks such that cross-origin requests are not authenticated by default. Because of these session-origin protections, and in the absence of any other unknown vulnerabilities that would bypass Laravel’s origin/session checks, this reflected-Origin CORS misconfiguration is not believed to be exploitable in typical PILOS deployments. This vulnerability has been patched in PILOS in v4.8.0
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.002 (9.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Thm Pilos
- Thm-Health Pilos — versions < 4.8.0
Weakness classification (CWE)
References
- github.com/THM-Health/PILOS/security/advisories/GHSA-pgfw-f4mp-5445 (Mitigation, Vendor Advisory)
- github.com/THM-Health/PILOS/commit/14655bc4f8128ffd2b3c25004b01d9a802808da8 (Patch)
Frequently asked questions
- What is CVE-2025-62523?
- CVE-2025-62523 is a medium-severity vulnerability in Thm Pilos, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 6.3/10. Published 2025-10-27.
- How severe is CVE-2025-62523?
- Medium severity. CVSS v3 base score is 6.3 out of 10.