CVE-2021-26084 (GCVE-0-2021-26084)

Vulnerability from cvelistv5 – Published: 2021-08-30 06:30 – Updated: 2025-12-16 18:04
VLAI CISA KEV
Summary
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 before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • Remote Code Execution
Assigner
References
Impacted products
Vendor Product Version
Atlassian Confluence Server Affected: unspecified , < 6.13.23 (custom)
Affected: 6.14.0 , < unspecified (custom)
Affected: unspecified , < 7.4.11 (custom)
Affected: 7.5.0 , < unspecified (custom)
Affected: unspecified , < 7.11.6 (custom)
Affected: 7.12.0 , < unspecified (custom)
Affected: unspecified , < 7.12.5 (custom)
Create a notification for this product.
Atlassian Confluence Data Center Affected: unspecified , < 6.13.23 (custom)
Affected: 6.14.0 , < unspecified (custom)
Affected: unspecified , < 7.4.11 (custom)
Affected: 7.5.0 , < unspecified (custom)
Affected: unspecified , < 7.11.6 (custom)
Affected: 7.12.0 , < unspecified (custom)
Affected: unspecified , < 7.12.5 (custom)
Create a notification for this product.
Date Public
2021-08-10 00:00
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6d621247-2552-48c4-bb8b-05fae0429f21

Vulnerability ID: CVE-2021-26084

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability | Affected: Atlassian / Confluence Server and Data Center | Description: 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: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-26084
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-917
Feed CISA Known Exploited Vulnerabilities Catalog
Product Confluence Server and Data Center
Due Date 2021-11-17
Date Added 2021-11-03
Vendorproject Atlassian
Vulnerabilityname Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 12:28 UTC | Updated: 2026-02-06 07:17 UTC
Show details on NVD website
To clipboard 

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}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.