How severe is CVE-2026-33755?

CVE-2026-33755 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33755 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33755?

CVE-2026-33755 affects Intermesh Group-office. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33755?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33755 have an EU (EUVD) identifier?

Yes. CVE-2026-33755 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16622.

When was CVE-2026-33755 published?

CVE-2026-33755 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-33755

CVE-2026-33755 is a high-severity vulnerability in Intermesh Group-office with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-89.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16622
Weakness: CWE-89
Affected product: Intermesh Group-office
Published: 2026-03-27
Last modified: 2026-06-17

Description

Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.158, 25.0.92, and 26.0.17, an authenticated SQL Injection vulnerability in the JMAP `Contact/query` endpoint allows any authenticated user with basic addressbook access to extract arbitrary data from the database — including active session tokens of other users. This enables full account takeover of any user, including the System Administrator, without knowing their password. Versions 6.8.158, 25.0.92, and 26.0.17 fix the issue.

Frequently asked questions

What is CVE-2026-33755?: Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.158, 25.0.92, and 26.0.17, an authenticated SQL Injection vulnerability in the JMAP `Contact/query` endpoint allows any authenticated user with basic addressbook access to extract arbitrary data from the database — including active session tokens of other users. This enables full account takeover of any user, including the System Administrator, without knowing their password. Versions 6.8.158, 25.0.92, and 26.0.17 fix the issue.
How severe is CVE-2026-33755?: CVE-2026-33755 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33755 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33755?: CVE-2026-33755 affects Intermesh Group-office. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33755?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33755 have an EU (EUVD) identifier?: Yes. CVE-2026-33755 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16622.
When was CVE-2026-33755 published?: CVE-2026-33755 was published on 2026-03-27 and last updated on 2026-06-17.

References

https://github.com/Intermesh/groupoffice/security/advisories/GHSA-3gc4-5993-c2qc

Affected products (1)

cpe:2.3:a:intermesh:group-office:*:*:*:*:*:*:*:*

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