CVE-2021-26085

Name: CVE-2021-26085
Creator: NVD / NIST
Published: 2021-08-03T00:15:08.557+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10Actively ExploitedEPSS 99.94%

Last modified Jun 17, 2026

CVE-2021-26085 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 99.94% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

99.94%

100.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Apr 18, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Atlassian	Confluence Data Center	< 7.4.10
Atlassian	Confluence Data Center	>= 7.5.0, < 7.12.3
Atlassian	Confluence Server	< 7.4.10
Atlassian	Confluence Server	>= 7.5.0, < 7.12.3

References

http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.htmlExploit, Third Party Advisory, VDB Entry
https://jira.atlassian.com/browse/CONFSERVER-67893Issue Tracking, Vendor Advisory
http://packetstormsecurity.com/files/164401/Atlassian-Confluence-Server-7.5.1-Arbitrary-File-Read.htmlExploit, Third Party Advisory, VDB Entry
https://jira.atlassian.com/browse/CONFSERVER-67893Issue Tracking, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26085US Government Resource

Timeline

Published: Aug 3, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-26085?

How severe is CVE-2021-26085?

CVE-2021-26085 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 99.94% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-26085?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26085?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST