How severe is CVE-2016-5663?

CVE-2016-5663 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2016-5663 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-5663?

CVE-2016-5663 affects Accellion Kiteworks Appliance. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-5663?

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

When was CVE-2016-5663 published?

CVE-2016-5663 was published on 2016-08-26 and last updated on 2026-06-17.

CVE-2016-5663

CVE-2016-5663 is a medium-severity vulnerability in Accellion Kiteworks Appliance with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Accellion Kiteworks Appliance
Published: 2016-08-26
Last modified: 2026-06-17

Description

Multiple cross-site scripting (XSS) vulnerabilities in oauth_callback.php on Accellion Kiteworks appliances before kw2016.03.00 allow remote attackers to inject arbitrary web script or HTML via the (1) code, (2) error, or (3) error_description parameter.

Frequently asked questions

What is CVE-2016-5663?: Multiple cross-site scripting (XSS) vulnerabilities in oauth_callback.php on Accellion Kiteworks appliances before kw2016.03.00 allow remote attackers to inject arbitrary web script or HTML via the (1) code, (2) error, or (3) error_description parameter.
How severe is CVE-2016-5663?: CVE-2016-5663 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2016-5663 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-5663?: CVE-2016-5663 affects Accellion Kiteworks Appliance. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-5663?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-5663 published?: CVE-2016-5663 was published on 2016-08-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:accellion:kiteworks_appliance:*:*:*:*:*:*:*:*

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