CVE-2025-64781: groupsession — Fix

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.

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CVSS v3.1 Score

4.7

MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

Weakness Type (CWE)

CWE-1188 CWE-1188

Affected Products

Vendor	Product	Versions
groupsession	groupsession	< 5.7.1
groupsession	groupsession	< 5.7.1
groupsession	groupsession	< 5.7.1

References

Advisories & Patches

https://groupsession.jp/info/info-news/security20251208

Other References

https://jvn.jp/en/jp/JVN19940619/

Frequently Asked Questions

What is CVE-2025-64781? +

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. It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2025-64781? +

CVE-2025-64781 has a CVSS v3.1 score of 4.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-64781? +

CVE-2025-64781 affects products from groupsession, specifically: groupsession. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-64781? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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