How severe is CVE-2023-26456?

CVE-2023-26456 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-2023-26456 being actively exploited?

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

What products are affected by CVE-2023-26456?

CVE-2023-26456 primarily affects Open-xchange Ox Guard. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-26456?

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

When was CVE-2023-26456 published?

CVE-2023-26456 was published on 2023-11-02 and last updated on 2026-06-17.

CVE-2023-26456

CVE-2023-26456 is a medium-severity vulnerability in Open-xchange Ox Guard 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)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Open-xchange Ox Guard
Published: 2023-11-02
Last modified: 2026-06-17

Description

Users were able to set an arbitrary "product name" for OX Guard. The chosen value was not sufficiently sanitized before processing it at the user interface, allowing for indirect cross-site scripting attacks. Accounts that were temporarily taken over could be configured to trigger persistent code execution, allowing an attacker to build a foothold. Sanitization is in place for product names now. No publicly available exploits are known.

Frequently asked questions

What is CVE-2023-26456?: Users were able to set an arbitrary "product name" for OX Guard. The chosen value was not sufficiently sanitized before processing it at the user interface, allowing for indirect cross-site scripting attacks. Accounts that were temporarily taken over could be configured to trigger persistent code execution, allowing an attacker to build a foothold. Sanitization is in place for product names now. No publicly available exploits are known.
How severe is CVE-2023-26456?: CVE-2023-26456 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-2023-26456 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26456?: CVE-2023-26456 primarily affects Open-xchange Ox Guard. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-26456?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-26456 published?: CVE-2023-26456 was published on 2023-11-02 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:open-xchange:ox_guard:*:*:*:*:*:*:*:*
cpe:2.3:a:open-xchange:ox_guard:2.10.7:-:*:*:*:*:*:*
cpe:2.3:a:open-xchange:ox_guard:2.10.7:rev4:*:*:*:*:*:*
cpe:2.3:a:open-xchange:ox_guard:2.10.7:rev5:*:*:*:*:*:*
cpe:2.3:a:open-xchange:ox_guard:2.10.7:rev6:*:*:*:*:*:*

More vulnerabilities in Open-xchange Ox Guard

CVE-2018-10986 — High (CVSS 8.8): OX Guard 2.8.0 has CSRF.
CVE-2015-8542 — High (CVSS 8.8): An issue was discovered in Open-Xchange Guard before 2.2.0-rev8. The "getprivkeybyid" API call is used to download a…
CVE-2020-28944 — High (CVSS 7.5): OX Guard 2.10.4 and earlier allows a Denial of Service via a WKS server that responds slowly or with a large amount of…
CVE-2016-4028 — High (CVSS 7.5): An issue was discovered in Open-Xchange OX Guard before 2.4.0-rev8. OX Guard uses an authentication token to identify…
CVE-2020-9426 — Medium (CVSS 6.1): OX Guard 2.10.3 and earlier allows XSS.
CVE-2016-6854 — Medium (CVSS 6.1): An issue was discovered in Open-Xchange OX Guard before 2.4.2-rev5. Script code which got injected to a mail with…

All CVEs affecting Open-xchange Ox Guard →

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