How severe is CVE-2016-6668?

CVE-2016-6668 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2016-6668 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6668?

CVE-2016-6668 primarily affects Atlassian Confluence Server. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6668?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-6668 published?

CVE-2016-6668 was published on 2017-01-23 and last updated on 2026-06-17.

CVE-2016-6668

CVE-2016-6668 is a high-severity vulnerability in Atlassian Confluence Server with a CVSS 3.x base score of 7.5. 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-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Atlassian Confluence Server
Published: 2017-01-23
Last modified: 2026-06-17

Description

The Atlassian Hipchat Integration Plugin for Bitbucket Server 6.26.0 before 6.27.5, 6.28.0 before 7.3.7, and 7.4.0 before 7.8.17; Confluence HipChat plugin 6.26.0 before 7.8.17; and HipChat for JIRA plugin 6.26.0 before 7.8.17 allows remote attackers to obtain the secret key for communicating with HipChat instances by reading unspecified pages.

Frequently asked questions

What is CVE-2016-6668?: The Atlassian Hipchat Integration Plugin for Bitbucket Server 6.26.0 before 6.27.5, 6.28.0 before 7.3.7, and 7.4.0 before 7.8.17; Confluence HipChat plugin 6.26.0 before 7.8.17; and HipChat for JIRA plugin 6.26.0 before 7.8.17 allows remote attackers to obtain the secret key for communicating with HipChat instances by reading unspecified pages.
How severe is CVE-2016-6668?: CVE-2016-6668 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2016-6668 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6668?: CVE-2016-6668 primarily affects Atlassian Confluence Server. In total, 30 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6668?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-6668 published?: CVE-2016-6668 was published on 2017-01-23 and last updated on 2026-06-17.

References

Affected products (30)

cpe:2.3:a:atlassian:confluence_server:5.5.0:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.1:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.2:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.3:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.4:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.5:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.6:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.7:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.8:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.9:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.10:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.11:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.9.12:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.10.0:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.10.1:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.10.2:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:confluence_server:5.10.3:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:6.26.0:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:6.26.10:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:6.29.1:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:6.29.2:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:6.31.0:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:7.1.0:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:7.2.1:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:7.3.2:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:7.3.3:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:7.4.1:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:7.8.1:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:7.8.3:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_integration_for_hipchat:7.8.12:*:*:*:*:*:*:*

More vulnerabilities in Atlassian Confluence Server

CVE-2023-22527 — Critical (CVSS 9.8): A template injection vulnerability on older versions of Confluence Data Center and Server allows an unauthenticated…
CVE-2023-22518 — Critical (CVSS 9.8): All versions of Confluence Data Center and Server are affected by this unexploited vulnerability. This Improper…
CVE-2023-22515 — Critical (CVSS 9.8): Atlassian has been made aware of an issue reported by a handful of customers where external attackers may have…
CVE-2022-26136 — Critical (CVSS 9.8): A vulnerability in multiple Atlassian products allows a remote, unauthenticated attacker to bypass Servlet Filters used…
CVE-2022-26134 — Critical (CVSS 9.8): In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an…
CVE-2021-26084 — Critical (CVSS 9.8): In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an…

All CVEs affecting Atlassian Confluence Server →

Other CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities

CVE-2026-27604 — Critical (CVSS 10.0): FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version…
CVE-2026-40965 — Critical (CVSS 10.0): Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a…
CVE-2026-42826 — Critical (CVSS 10.0): Exposure of sensitive information to an unauthorized actor in Azure DevOps allows an unauthorized attacker to disclose…
CVE-2025-29270 — Critical (CVSS 10.0): Incorrect access control in the realtime.cgi endpoint of Deep Sea Electronics devices DSE855 v1.1.0 to v1.1.26 allows…
CVE-2025-61481 — Critical (CVSS 10.0): An issue in MikroTik RouterOS v.7.14.2 and SwOS v.2.18 exposes the WebFig management interface over cleartext HTTP by…
CVE-2025-53624 — Critical (CVSS 10.0): The Docusaurus gists plugin adds a page to your Docusaurus instance, displaying all public gists of a GitHub user.…

Browse all CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities →