How severe is CVE-2017-16856?

CVE-2017-16856 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-2017-16856 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-16856?

CVE-2017-16856 affects Atlassian Confluence. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-16856?

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

When was CVE-2017-16856 published?

CVE-2017-16856 was published on 2017-12-05 and last updated on 2026-06-17.

CVE-2017-16856

CVE-2017-16856 is a medium-severity vulnerability in Atlassian Confluence 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% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Atlassian Confluence
Published: 2017-12-05
Last modified: 2026-06-17

Description

The RSS Feed macro in Atlassian Confluence before version 6.5.2 allows remote attackers to inject arbitrary HTML or JavaScript via cross site scripting (XSS) vulnerabilities in various rss properties which were used as links without restriction on their scheme.

Frequently asked questions

What is CVE-2017-16856?: The RSS Feed macro in Atlassian Confluence before version 6.5.2 allows remote attackers to inject arbitrary HTML or JavaScript via cross site scripting (XSS) vulnerabilities in various rss properties which were used as links without restriction on their scheme.
How severe is CVE-2017-16856?: CVE-2017-16856 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-2017-16856 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-16856?: CVE-2017-16856 affects Atlassian Confluence. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-16856?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-16856 published?: CVE-2017-16856 was published on 2017-12-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:atlassian:confluence:*:*:*:*:*:*:*:*

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