CVEs / CVE-2021-26085
CVE-2021-26085: Atlassian Confluence Server Pre-Authorization Arbitrary File Read Vulnerability
- Known exploited in the CISA KEV catalog since 28 Mar 2022
- medium 5.3 CVSS 3.1 (NVD)
- EPSS 99.9% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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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.
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. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Atlassian Confluence Server | from unspecified, before 7.4.10 | 7.4.10 |
| Atlassian Confluence Server | from 7.5.0, before unspecified | unspecified |
| Atlassian Confluence Server | from unspecified, before 7.12.3 | 7.12.3 |
| Atlassian Confluence Data Center | from unspecified, before 7.4.10 | 7.4.10 |
| Atlassian Confluence Data Center | from 7.5.0, before unspecified | unspecified |
| Atlassian Confluence Data Center | from unspecified, before 7.12.3 | 7.12.3 |
Exploitation
| In CISA KEV since | 28 Mar 2022 |
|---|---|
| Due date for US federal agencies | 18 Apr 2022 |
| Used in ransomware campaigns | Known |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 3.1 | 5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NScored by NVD |
|---|---|
| Weakness | CWE-425 |
References
- CVE-2021-26085 on NVD
- CVE-2021-26085 in the CISA KEV catalog
- http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.html Exploit, Third Party Advisory, VDB Entry
- https://jira.atlassian.com/browse/CONFSERVER-67893 Issue Tracking, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26085 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.