XSS in Selfbest
CVE-2025-63416
** exclusively-hosted-service ** A Stored Cross-Site Scripting (XSS) vulnerability in the chat functionality of the SelfBest platform 2023.3 allows authenticated low-privileged attackers to execute arbitrary JavaScript in the context of other users' sessions. This can be exploited to access administrative data and functions, leading to privilege escalation and full compromise of sensitive user data, as demonstrated by the ability to fetch and exfiltrate the contents of the /admin/users endpoint.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.004 (28.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Selfbest — versions 2023.3
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Product)
- cve@mitre.org (Exploit, Third Party Advisory, Mitigation)
Frequently asked questions
- What is CVE-2025-63416?
- CVE-2025-63416 is a critical-severity vulnerability in Selfbest, classified under Cross-site Scripting. CVSS score: 9.1/10. Published 2025-11-05.
- How severe is CVE-2025-63416?
- Critical severity. CVSS v3 base score is 9.1 out of 10.