VulnTideExploited vulnerabilities, by vendor. Data as of 28 Oct 2026.
Known exploitedIn CISA's KEV catalog since 2 June 2022Ransomware use: known
Atlassian Confluence Server/Data Center

CVE-2022-26134: Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 2 Jun 2022, 1 day before the CVE record was published.

How likely is exploitation in the next 30 days?
100%

EPSS score, percentile 100 of all scored records

How severe?
9.8 Critical

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

Required action (CISA), due 6 Jun 2022: Immediately block all internet traffic to and from affected products AND apply the update per vendor instructions [https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html] OR remove the affected products by the due date on the right. Note: Once the update is successfully deployed, agencies can reassess the internet blocking rules.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected: next of 1.3.0; before 7.4.17; 7.13.0; before 7.13.7; 7.14.0; before 7.14.3; 7.15.0; before 7.15.2; 7.16.0; before 7.16.4; 7.17.0; before 7.17.4; next of 1.3.0; before 7.4.17; 7.13.0; before 7.13.7; 7.14.0; before 7.14.3; 7.15.0; before 7.15.2; 7.16.0; before 7.16.4; 7.17.0; before 7.17.4

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

Immediately block all internet traffic to and from affected products AND apply the update per vendor instructions [https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html] OR remove the affected products by the due date on the right. Note: Once the update is successfully deployed, agencies can reassess the internet blocking rules.

CISA due date for this action: 6 June 2022.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

Affected products and versions

As listed in the CVE record.

Atlassian Confluence Data Center
StatusVersions
Affectednext of 1.3.0
Affectedbefore 7.4.17
Affected7.13.0
Affectedbefore 7.13.7
Affected7.14.0
Affectedbefore 7.14.3
Affected7.15.0
Affectedbefore 7.15.2
Affected7.16.0
Affectedbefore 7.16.4
Affected7.17.0
Affectedbefore 7.17.4

And 2 more version entries in the CVE record.

Atlassian Confluence Server
StatusVersions
Affectednext of 1.3.0
Affectedbefore 7.4.17
Affected7.13.0
Affectedbefore 7.13.7
Affected7.14.0
Affectedbefore 7.14.3
Affected7.15.0
Affectedbefore 7.15.2
Affected7.16.0
Affectedbefore 7.16.4
Affected7.17.0
Affectedbefore 7.17.4

And 2 more version entries in the CVE record.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Atlassian Confluence Server and Data Center contain a remote code execution vulnerability that allows for an unauthenticated attacker to perform remote code execution.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

  • CISA added CVE-2022-26134 to its Known Exploited Vulnerabilities (KEV) catalog on 2 Jun 2022.
  • CISA marks it as known to be used in ransomware campaigns.
  • The due date CISA sets for the required action is 6 Jun 2022.
  • The CVE record was published on 3 Jun 2022, 1 day after it was added to KEV.
  • The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), taken from CISA's enrichment of the record.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 100% (percentile 100), as of 28 Oct 2026.
  • CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are from 1.3.0 before 7.4.17, from 7.13.0 before 7.13.7, from 7.14.0 before 7.14.3, from 7.15.0 before 7.15.2, from 7.16.0 before 7.16.4, from 7.17.0 before 7.17.4, and from 7.18.0 before 7.18.1.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

  • CWE-917: Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

DateEvent
2 Jun 2022Added to CISA KEV
3 Jun 2022CVE record published
6 Jun 2022CISA due date for the required action
21 Oct 2025CVE record last updated

References

More exploited Atlassian vulnerabilities

  • CVE-2026-21589: Atlassian Multiple Products Files or Directories Accessible to External Parties Vulnerability (added 15 Oct 2026)
  • CVE-2021-26086: Atlassian Jira Server and Data Center Path Traversal Vulnerability (added 12 Nov 2024)
  • CVE-2023-22527: Atlassian Confluence Data Center and Server Template Injection Vulnerability (added 24 Jan 2024)
  • CVE-2023-22518: Atlassian Confluence Data Center and Server Improper Authorization Vulnerability (added 7 Nov 2023)
  • CVE-2023-22515: Atlassian Confluence Data Center and Server Broken Access Control Vulnerability (added 5 Oct 2023)
  • CVE-2022-36804: Atlassian Bitbucket Server and Data Center Command Injection Vulnerability (added 30 Sep 2022)