CVE-2025-61987CWE-1385

CVE-2025-61987

Medium · published December 12, 2025

CVSS v3.0

5.3

EPSS

Percentile

3.9

In the wild

Unconfirmed

What it is

GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2. do not validate origins in WebSockets. If a user accesses a crafted page, Chat information sent to the user may be exposed.

The record

Technical detail

CVSS v3.0: 5.3 · MEDIUM
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0: Not supplied
EPSS: 0.00151 · 3.9th percentile
Weakness: CWE-1385 · Missing Origin Validation in WebSockets
Published: 2025-12-12T10:16Z

Affected products (3)

Product	Versions	Fixed in
groupsession/groupsession	< 5.3.0	5.3.0
groupsession/groupsession	< 5.3.2	5.3.2
groupsession/groupsession	< 5.3.3	5.3.3

References (2)

https://groupsession.jp/info/info-news/security20251208 · [email protected]https://jvn.jp/en/jp/JVN19940619/ · [email protected]

EPSS history

Timeline

12 DEC 05:02Z
GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2
cvelistv5