Every exploited vulnerability / Atlassian
CVE-2021-26086 in Atlassian Jira Server and Data Center: known exploited
Generated from its entry in CISA's catalogue of known exploited vulnerabilities as of 3 November 2026.
Attackers are exploiting CVE-2021-26086 in Atlassian Jira Server and Data Center. CISA has listed it as known exploited since 12 November 2024.
| Product | Atlassian Jira Server and Data Center |
|---|---|
| Known exploited since | 12 November 2024 |
| Ransomware use | Not recorded |
| EU vulnerability database | EUVD-2021-12907 |
| Sources | NVD · CISA KEV |
What it means
Attackers have used this vulnerability in real attacks. An unpatched Atlassian Jira Server and Data Center that can be reached from the internet is exposed to them.
What to do
- Apply the vendor's fix to every system running Atlassian Jira Server and Data Center, starting with those reachable from the internet. Take a system off the internet until it can be fixed.
- Check the system for signs that it was reached before the fix.
How Vardion finds it
Wherever a scan or your imported scanner results find CVE-2021-26086, Vardion names the systems affected and puts the fix at the top of the list.