Description
In GroupSession, a Circular notice can be created with its memo field non-editable, but the authorization check is improperly implemented. With some crafted request, a logged-in user may alter the memo field. The affected products and versions are GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2.
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
4.3
EPSS
0.0005
EPSS Percentile
16.0%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-639
Status
published
Products (3)
groupsession/groupsession
< 5.3.0
groupsession/groupsession
< 5.3.2
groupsession/groupsession
< 5.3.3
Published
Dec 12, 2025
Tracked Since
Feb 18, 2026