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CVE-2025-64781

MEDIUM
5.1
CVSS Score
Published: December 12, 2025 at 05:02 AM UTC
Updated: October 7, 2026 at 08:10 PM UTC
2 products affected across 2 vendorsGroupsessionGroupSession

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Severity
MEDIUM5.1
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Groupsession· Groupsession
95%
v < 5.7.1
Affected range stops below 5.7.1, so it looks safe — our inference, not a vendor statement
GroupSession· Japan Total System
60%
v < er5.7.1
Affected range stops below er5.7.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://groupsession.jp/info/info-news/security20251208
Third Party Advisory
Source: cverecord
https://jvn.jp/en/jp/JVN19940619/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.1MEDIUMjpcert
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1188

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