How severe is CVE-2017-16906?

CVE-2017-16906 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-2017-16906 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-16906?

CVE-2017-16906 affects Horde Groupware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-16906?

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

When was CVE-2017-16906 published?

CVE-2017-16906 was published on 2017-11-20 and last updated on 2026-06-17.

CVE-2017-16906

CVE-2017-16906 is a medium-severity vulnerability in Horde Groupware 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 v2: 3.5
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Horde Groupware
Published: 2017-11-20
Last modified: 2026-06-17

Description

In Horde Groupware 5.2.19-5.2.22, there is XSS via the URL field in a "Calendar -> New Event" action.

Frequently asked questions

What is CVE-2017-16906?: In Horde Groupware 5.2.19-5.2.22, there is XSS via the URL field in a "Calendar -> New Event" action.
How severe is CVE-2017-16906?: CVE-2017-16906 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-2017-16906 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-16906?: CVE-2017-16906 affects Horde Groupware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-16906?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-16906 published?: CVE-2017-16906 was published on 2017-11-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:horde:groupware:*:*:*:*:*:*:*:*

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