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CVE-2021-26085 (GCVE-0-2021-26085)

Vulnerability from cvelistv5 – Published: 2021-08-03 00:00 – Updated: 2025-10-21 23:25
VLAI CISA Previdian
Summary
Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read vulnerability in the /s/ endpoint. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-07 12:29 UTC
CWE
  • Pre-Authorization Arbitrary File Read
  • CWE-425 - Direct Request ('Forced Browsing')
Assigner
References
Impacted products
Vendor Product Version CPE status
Atlassian Confluence Server Affected: unspecified , < 7.4.10 (custom)
Affected: 7.5.0 , < unspecified (custom)
Affected: unspecified , < 7.12.3 (custom)
guessed Create a notification for this product.
Atlassian Confluence Data Center Affected: unspecified , < 7.4.10 (custom)
Affected: 7.5.0 , < unspecified (custom)
Affected: unspecified , < 7.12.3 (custom)
guessed Create a notification for this product.
Date Public
2021-07-29 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8b0072f5-f85e-4406-8ef8-aae614fb5cae

Vulnerability ID: CVE-2021-26085

Status: Confirmed

Status Updated: 2022-03-28 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-03-28
Asserted: 2022-03-28
Scope
Notes: KEV entry: Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability | Affected: Atlassian / Confluence Server | Description: Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a pre-authorization arbitrary file read vulnerability in the /s/ endpoint. | Required action: Apply updates per vendor instructions. | Due date: 2022-04-18 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-26085
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-425
Feed CISA Known Exploited Vulnerabilities Catalog
Product Confluence Server
Due Date 2022-04-18
Date Added 2022-03-28
Vendorproject Atlassian
Vulnerabilityname Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 12:27 UTC | Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: bd91315d-3fd6-4894-98d9-4d11b683acff

Vulnerability ID: CVE-2021-26085

Status: Confirmed

Status Updated: 2022-03-28 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-03-28
Asserted: 2022-03-28
Scope
Notes: KEVIntel entry: Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read... | Affected: Atlassian / Confluence Server, Confluence Data Center | CVSS: 5.3 (MEDIUM) | 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 Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read...
Vendor Atlassian
Product Confluence Server, Confluence Data Center
Added Date 2022-03-28T00:00:00.000Z
Cvss Score 5.3
Epss Score None
Cvss Severity MEDIUM
Epss Percentile None
Used In Malware yes
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:05 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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    "redhat_vex": {
      "current_release_date": "2026-03-27T14:30:36+00:00",
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      "id": "CVE-2021-26085",
      "initial_release_date": "2021-07-29T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
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}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.