How severe is CVE-2026-23887?

CVE-2026-23887 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-23887 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23887?

CVE-2026-23887 affects Group-office Group Office. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23887?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-23887 have an EU (EUVD) identifier?

Yes. CVE-2026-23887 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4201.

When was CVE-2026-23887 published?

CVE-2026-23887 was published on 2026-01-22 and last updated on 2026-06-17.

CVE-2026-23887

CVE-2026-23887 is a medium-severity vulnerability in Group-office Group Office with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 5.1
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4201
Weakness: CWE-79
Affected product: Group-office Group Office
Published: 2026-01-22
Last modified: 2026-06-17

Description

Group-Office is an enterprise customer relationship management and groupware tool. In versions 6.8.148 and below, and 25.0.1 through 25.0.79, the application stores unsanitized filenames in the database, which can lead to Stored Cross-Site Scripting (XSS). Users who interact with these specially crafted file names within the Group-Office application are affected. While the scope is limited to the file-viewing context, it could still be used to interfere with user sessions or perform unintended actions in the browser. This issue is fixed in versions 6.8.149 and 25.0.80.

Frequently asked questions

What is CVE-2026-23887?: Group-Office is an enterprise customer relationship management and groupware tool. In versions 6.8.148 and below, and 25.0.1 through 25.0.79, the application stores unsanitized filenames in the database, which can lead to Stored Cross-Site Scripting (XSS). Users who interact with these specially crafted file names within the Group-Office application are affected. While the scope is limited to the file-viewing context, it could still be used to interfere with user sessions or perform unintended actions in the browser. This issue is fixed in versions 6.8.149 and 25.0.80.
How severe is CVE-2026-23887?: CVE-2026-23887 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-23887 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23887?: CVE-2026-23887 affects Group-office Group Office. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23887?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23887 have an EU (EUVD) identifier?: Yes. CVE-2026-23887 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4201.
When was CVE-2026-23887 published?: CVE-2026-23887 was published on 2026-01-22 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Group-office Group Office

CVE-2026-25512 — High (CVSS 8.8): Group-Office is an enterprise customer relationship management and groupware tool. Prior to versions 6.8.150, 25.0.82,…
CVE-2026-25134 — High (CVSS 8.8): Group-Office is an enterprise customer relationship management and groupware tool. Prior to 6.8.150, 25.0.82, and…
CVE-2025-63406 — High (CVSS 8.8): An issue in Intermesh BV GroupOffice vulnerable before v.25.0.47 and 6.8.136 allows a remote attacker to execute…
CVE-2023-46730 — High (CVSS 7.4): Group-Office is an enterprise CRM and groupware tool. In affected versions there is full Server-Side Request Forgery…
CVE-2024-22418 — Medium (CVSS 6.5): Group-Office is an enterprise CRM and groupware tool. Affected versions are subject to a vulnerability which is present…
CVE-2023-25292 — Medium (CVSS 6.1): Reflected Cross Site Scripting (XSS) in Intermesh BV Group-Office version 6.6.145, allows attackers to gain escalated…

All CVEs affecting Group-office Group Office →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →