CVE-2025-64781
MediumCVSS 4.7Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
GroupSession Free edition, byCloud, and ZION before version 5.7.1 have the "External page display restriction" 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.
Risk Assessment
Users can be redirected to malicious websites, potentially leading to data theft, malware installation, or phishing.
Recommendation
Update GroupSession to version 5.7.1 or later. Change the default configuration to restrict external page display, and educate users about the risks of clicking unknown links.
Other vulnerabilities in GroupSession
See all- CVE-2025-57883Medium
Reflected cross-site scripting vulnerability in GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2. If a user accesses a crafted page or URL, an arbitrary script may be executed in the user's browser.
- CVE-2025-54407Medium
Stored cross-site scripting vulnerability in GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION prior to ver5.3.2. If a user accesses a crafted page or URL, an arbitrary script may be executed in the user's browser.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS