CVE-2026-25511: Group-Office is an enterprise customer relationship management and groupware tool

Routine

MEDIUM 4.9UPGRADE

CVE-2026-25511 is a medium-severity flaw (CVSS 4.9) affecting group office. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.150, 25.0.82, and 26.0.5, an authenticated user within the System Administrator group can trigger a full SSRF via the WOPI service discovery URL, including access to internal hosts/ports. The SSRF response body can be exfiltrated via the built‑in debug system, turning it into a visible SSRF. This also allows full server-side file read. This is

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-02-04
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: group-office

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-04 21:16 UTCPublished CVE record published
2026-06-17 10:24 UTCUpdated Record last modified

group-office group office UPGRADE

Affected: >= 6.8.0 and < 6.8.150 · >= 25.0.1 and < 25.0.82 · >= 26.0.1 and < 26.0.5

Fixed in: 6.8.150, 25.0.82, 26.0.5

Safe to downgrade to: a release before 6.8.0

1. Check installed version

apt-cache policy group-office || rpm -q group-office || group-office --version

2. UPGRADE to 6.8.150 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade group-office

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade group-office

Note

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

3. If no update is available yet, DOWNGRADE to a release before 6.8.0 (Debian / Ubuntu)

apt-cache madison group-office sudo apt install group-office=<VERSION_BEFORE_6.8.0> sudo apt-mark hold group-office

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list group-office sudo dnf downgrade group-office-<VERSION_BEFORE_6.8.0> sudo dnf versionlock add group-office

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-25511?

group office: upgrade to 6.8.150, 25.0.82, 26.0.5. Exact commands for each OS are on this page.

Is CVE-2026-25511 being exploited?

CVE-2026-25511 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-2026-25511 affect?

CVE-2026-25511 affects group office. Severity is medium (CVSS 4.9). Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.150, 25.0.82, and 26.0.5, an authenticated user within the System Administrator group can trigger a full SSRF via the WOPI service disc

How urgent is CVE-2026-25511?

Priority 32/100. Public exploit reference

Related CVEs

CVE-2026-25512 HIGH 8.8 UPGRADE Group-Office is an enterprise customer relationship management and groupware tool
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CVE-2025-63406 HIGH 8.8 UPGRADE An issue in Intermesh BV GroupOffice vulnerable before v.25.0.47 and 6.8.136 allows a remote attacker to execu
CVE-2025-53505 MEDIUM 5.3 UPGRADE Group-Office versions prior to 6.8.119 and prior to 25.0.20 provided by Intermesh BV contain a path traversal

References

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