CVE-2022-26134: in the CISA KEV catalogue

Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability. CISA added CVE-2022-26134 to the Known Exploited Vulnerabilities catalogue on 2022-06-02 with a default due date of 2022-06-06. Known ransomware campaign use: Known. Forensic triage flag: No.

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

Vendor / product: Atlassian Confluence Server/Data Center
CWE: CWE-917
CISA required action: 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.
EPSS: 100%, percentile 99 (scored 2026-11-04)

EPSS puts nearly every time in 100 odds (100%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.

Vendor and reference links (from CISA)

https://nvd.nist.gov/vuln/detail/CVE-2022-26134

Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.

Data dates. CISA KEV catalogue version 2026.11.04, released 2026-11-04, 1,768 entries (checked 2026-11-05). EPSS model v2026.06.15, scored 2026-11-04, 400,189 CVEs. Sources: CISA and FIRST (EPSS by FIRST; scores generated by Empirical Security). Copied to our own database and refreshed automatically; if a refresh fails, the previous copy keeps serving with its own date.

Frequently asked questions

Is CVE-2022-26134 in the CISA KEV catalogue?

Yes. CISA added CVE-2022-26134 (Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-06-02. CISA's default due date for it is 2022-06-06.

Is CVE-2022-26134 used in ransomware attacks?

CISA marks known ransomware campaign use as Known for CVE-2022-26134.

What should I do about CVE-2022-26134?

CISA's required action: 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.

Sources

CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
NVD record for CVE-2022-26134