CVE-2025-64781: In GroupSession Free edition prior to ver5.7.1, GroupSession byCloud prior to ver5.7.1, and GroupSession ZION

Q: How do I fix CVE-2025-64781?

groupsession: upgrade to 5.7.1. Exact commands for each OS are on this page.

Q: Is CVE-2025-64781 being exploited?

CVE-2025-64781 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-64781 affect?

CVE-2025-64781 affects groupsession. Severity is medium (CVSS 4.7). 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 configurat

Q: How urgent is CVE-2025-64781?

Priority 19/100. No elevated risk signals yet.

Routine

MEDIUM 4.7UPGRADE

CVE-2025-64781 is a medium-severity flaw (CVSS 4.7) affecting groupsession. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-1188
Published	2025-12-12
Last modified	2026-10-07

Publisher (CNA): JPCERT/CC · Vendor: groupsession

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-12 05:16 UTCPublished CVE record published
2026-10-07 20:10 UTCUpdated Record last modified

groupsession groupsession UPGRADE

Affected: < 5.7.1

Fixed in: 5.7.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy groupsession || rpm -q groupsession || groupsession --version

2. UPGRADE to 5.7.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade groupsession

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade groupsession

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-64781?

groupsession: upgrade to 5.7.1. Exact commands for each OS are on this page.

Is CVE-2025-64781 being exploited?

CVE-2025-64781 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-64781 affect?

CVE-2025-64781 affects groupsession. Severity is medium (CVSS 4.7). 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 configurat

How urgent is CVE-2025-64781?

Priority 19/100. No elevated risk signals yet.

Related CVEs

CVE-2025-61987 MEDIUM 5.3 UPGRADE GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and GroupSession ZION pri
CVE-2025-54407 MEDIUM 6.1 UPGRADE Stored cross-site scripting vulnerability exists in GroupSession Free edition prior to ver5.3.0, GroupSession
CVE-2025-57883 MEDIUM 6.1 UPGRADE Reflected cross-site scripting vulnerability exists in GroupSession Free edition prior to ver5.3.0, GroupSessi
CVE-2025-65120 MEDIUM 6.1 UPGRADE Reflected cross-site scripting vulnerability exists in GroupSession Free edition prior to ver5.7.1, GroupSessi
CVE-2025-53523 MEDIUM 5.4 UPGRADE Stored cross-site scripting vulnerabilities exist in GroupSession Free edition prior to ver5.3.0, GroupSession

References

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