Description
In GroupSession Free edition prior to ver5.7.1, GroupSession byCloud prior to ver5.7.1, and GroupSession ZION prior to ver5.7.1, "External page display restriction" is set to "Do not limit" in the initial configuration. With this configuration, the user may be redirected to an arbitrary website when accessing a specially crafted URL.
References (2)
Core 2
Core References
Vendor Advisory
https://groupsession.jp/info/info-news/security20251208
Third Party Advisory
https://jvn.jp/en/jp/JVN19940619/
Scores
CVSS v3
4.7
EPSS
0.0019
EPSS Percentile
8.3%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-1188
Status
published
Products (1)
groupsession/groupsession
< 5.7.1 (3 CPE variants)
Published
Dec 12, 2025
Tracked Since
Feb 18, 2026