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)

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 (7.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-55996: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

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.