XSS in Rakuten Viber

CVE-2025-55996

Viber Desktop 25.6.0 is vulnerable to HTML Injection via the text parameter of the message compose/forward interface

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (7.5th percentile) — read the EPSS interpretation.

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.

Affected products

Rakuten Viber
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

cve@mitre.org (Third Party Advisory)

Frequently asked questions

What is CVE-2025-55996?: CVE-2025-55996 is a medium-severity vulnerability in Rakuten Viber, classified under Cross-site Scripting. CVSS score: 6.3/10. Published 2025-09-12.
How severe is CVE-2025-55996?: Medium severity. CVSS v3 base score is 6.3 out of 10.
Is CVE-2025-55996 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.