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01 Record

CVE-2021-26084

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

CriticalKEVPUBLISHEDCNA: atlassian
CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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02 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

03 Exploitation and scoring

Exploitation
Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2021-11-03. Federal remediation due 2021-11-17. Known ransomware campaign use: reported by CISA.
SSVC decision
  • ExploitationactiveCISA reports credible evidence of active exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
99.99% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 99.9% of scored records. A rank, not a probability.
NVD base score
9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-08-30 06:30Z5 YR AGO
Last updated
2025-12-16 18:04Z10 MO AGO
Reserved
2021-01-25
Assigning CNA
atlassian
Record state
PUBLISHED
Severity
Critical (CVSS 9.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-917Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')Base
Data version
5.2
Document digest
4609e96a6105726171f275fd18a7f4f0b455f28fd4f036bd9b16e91167fc8d37

05 Affected products

VendorProductVersionsPlatforms
AtlassianConfluence Server< 6.13.23, 6.14.0 to < unspecified, < 7.4.11, 7.5.0 to < unspecified, < 7.11.6, 7.12.0 to < unspecified, < 7.12.5—
AtlassianConfluence Data Center< 6.13.23, 6.14.0 to < unspecified, < 7.4.11, 7.5.0 to < unspecified, < 7.11.6, 7.12.0 to < unspecified, < 7.12.5—

06 References