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CVE-2021-26084: Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability
Atlassian Confluence Server and Data Center · in CISA KEV since 2021-11-03
2021-11-03added to KEV
2021-11-17federal remediation due date
100.00%EPSS exploit probability (30 days) 100.0th percentile
9.8 CRITICALCVSS 3.1
Knownknown ransomware use
65days from NVD publication to KEV
What it is
Atlassian Confluence Server and Data Server contain an Object-Graph Navigation Language (OGNL) injection vulnerability that may allow an unauthenticated attacker to execute code.
Required action (CISA)
Apply updates per vendor instructions.
| CWE | CWE-917 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2021-08-30 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2021-26084.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.