# CVE-2021-26085: Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability

Source: https://junglewise.ai/threats/cve-2021-26085-atlassian-confluence-server-pre-authorization-arbitrary-file-read  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-03-28. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-26085 · Severity: critical · CVSS 5.3 · Exploited in the wild · Published 2022-03-28

Atlassian Confluence Server and Data Center are vulnerable to a pre-authorization arbitrary file read via the /s/ endpoint. Remote attackers can exploit this to view restricted resources without authentication.

Technologies: [Atlassian Confluence Data Center](https://junglewise.ai/threats/technologies/confluence-data-center), [Atlassian Confluence Server](https://junglewise.ai/threats/technologies/confluence-server). Vendors: [Atlassian](https://junglewise.ai/threats/vendors/atlassian).

## Quick answers

**Is CVE-2021-26085 exploited in the wild?** Yes. CVE-2021-26085 is known to be exploited in the wild, first recorded on 28 March 2022. Treat it as urgent.

**How severe is CVE-2021-26085?** Critical severity, with a CVSS score of 5.3, published 28 March 2022.

**Which products and versions are affected?** Atlassian Confluence Server < 7.4.10, 7.5.0 to < 7.12.3; Atlassian Confluence Data Center < 7.4.10, 7.5.0 to < 7.12.3.

**Is there a fix for CVE-2021-26085?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2021-26085 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2021-26085?** Check whether you run Atlassian Confluence Data Center or Atlassian Confluence Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Atlassian Confluence Server < 7.4.10, 7.5.0 to < 7.12.3
- Atlassian Confluence Data Center < 7.4.10, 7.5.0 to < 7.12.3

## Timeline

- 2021-08-02: disclosed: NVD Published Date
- 2022-03-28: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2022-03-28: advisory: External advisory publication date

## Related threats

- [Atlassian Data Center arbitrary file access without authentication](https://junglewise.ai/threats/cve-2026-21589-h3-summary-this-is-a-vulnerability-in-bitbucket-data-center)
- [Atlassian Confluence Data Center DoS in authenticated request handling](https://junglewise.ai/threats/cve-2026-21588-atlassian-confluence-data-center-dos-in-authenticated-request)
- [Atlassian Confluence Data Center improper authorization](https://junglewise.ai/threats/cve-2026-21586-atlassian-confluence-data-center-improper-authorization)
- [Atlassian Confluence Data Center information disclosure](https://junglewise.ai/threats/cve-2026-21579-atlassian-confluence-data-center-information-disclosure)
- [Atlassian Confluence Data Center denial of service](https://junglewise.ai/threats/cve-2026-21577-atlassian-confluence-data-center-denial-of-service)