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    CVE-2021-20789

    Open redirect vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to redirect a user to an arbitrary web site and conduct a phishing attack via a specially crafted URL.

    Published:Jul 28, 2021
    Last Modified:Nov 21, 2024
    EPS:Jul 28, 2021
    EPSS Score:0.00274
    CVSS Score:6.1

    Affected Products

    Vendor
    Groupsession
    Product
    Groupsession
    Vendor
    Groupsession
    Product
    Groupsession Bycloud
    Vendor
    Groupsession
    Product
    Groupsession Zion

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-178 Cross-Site Flashing

    Related CVEs

    CVE-2025-64781 (CVSS 5.1) — In GroupSession Free edition prior to ver5.7.1, GroupSession byCloud prior to ver5.7.1, and GroupSession ZION …
    CVE-2025-62192 (CVSS 5.3) — SQL Injection vulnerability exists in GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior …
    CVE-2025-58576 (CVSS 5.1) — Cross-site request forgery vulnerability exists in GroupSession Free edition prior to ver5.3.0, GroupSession b…
    CVE-2025-61987 (CVSS 6.9) — GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION pri…
    CVE-2025-61950 (CVSS 5.3) — In GroupSession, a Circular notice can be created with its memo field non-editable, but the authorization chec…
    CVE-2025-65120 (CVSS 5.1) — Reflected cross-site scripting vulnerability exists in GroupSession Free edition prior to ver5.7.1, GroupSessi…
    CVE-2025-57883 (CVSS 5.1) — Reflected cross-site scripting vulnerability exists in GroupSession Free edition prior to ver5.3.0, GroupSessi…
    CVE-2025-66284 (CVSS 4.8) — Stored cross-site scripting vulnerabilities exist in GroupSession Free edition prior to ver5.7.1, GroupSession…
    CVE-2025-53523 (CVSS 4.8) — Stored cross-site scripting vulnerabilities exist in GroupSession Free edition prior to ver5.3.0, GroupSession…
    CVE-2025-54407 (CVSS 5.1) — Stored cross-site scripting vulnerability exists in GroupSession Free edition prior to ver5.3.0, GroupSession …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High