Vulnerability in Atlassian Confluence Data Center
CVE-2021-26085
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 v…
EPSS: 0.999 (100.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Atlassian Confluence Data Center — versions unspecified, 7.5.0
- Atlassian Confluence_data_center
- Atlassian Confluence Server — versions unspecified, 7.5.0
- Atlassian Confluence_server
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Known ransomware campaign use: yes.
Public proof-of-concept exploits
References
- security@atlassian.com (x_refsource_MISC, Issue Tracking, Vendor Advisory)
- security@atlassian.com (Exploit, VDB Entry, Third Party Advisory, x_refsource_MISC)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2021-26085?
- CVE-2021-26085 is a medium-severity vulnerability in Atlassian Confluence Data Center, classified under Direct Request (Forced Browsing). CVSS score: 5.3/10. Published 2021-08-03.
- How severe is CVE-2021-26085?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2021-26085 known to be exploited?
- Yes. CVE-2021-26085 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-28), indicating it is being actively exploited. 51 public proof-of-concept repositories are indexed.