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

Vulnerability from cvelistv5 – Published: 2021-08-30 06:30 – Updated: 2025-12-16 18:04
VLAI CISA Shadowserver KEVIntel
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
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • Remote Code Execution
  • CWE-917 - Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
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
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
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: cc0e2214-e7e0-4c19-af27-4b813a1f7a83

Vulnerability ID: CVE-2021-26084

Status: Confirmed

Status Updated: 2026-07-08 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2023-10-14
Asserted: 2023-10-14
Last Seen: 2026-07-08
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Atlassian / Confluence | Class: web-app-framework | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-07-08: 17
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 12
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class web-app-framework
7D Avg 3
Vendor Atlassian
30D Avg 6
90D Avg 10
Product Confluence
Cisa Kev yes
Connections 17
Observation Date 2026-07-08
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-06-30 09:22 UTC | Updated: 2026-07-10 01:00 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 879ce241-1757-46b2-b08b-35b572560a15

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: KEVIntel entry: In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to... | Affected: Atlassian / Confluence Server, Confluence Data Center | CVSS: 9.8 (CRITICAL) | EPSS: 0.99999 | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to...
Vendor Atlassian
Product Confluence Server, Confluence Data Center
Added Date 2021-11-03T00:00:00.000Z
Cvss Score 9.8
Epss Score 0.99999
Cvss Severity CRITICAL
Epss Percentile 0.99992
Used In Malware yes
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:04 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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      "product_status:known_not_affected": "1",
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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.