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Known exploited vulnerability

CVE-2021-26085

mediumCVSS 3.1 5.3In CISA KEVRansomwareEPSS 100%Published · Atlassian

The short answer

CVE-2021-26085 affects Atlassian Confluence Server and is rated medium (CVSS 5.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2022-03-28: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-425.

Severity

5.3 medium

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

Exploited (CISA KEV)

Yes, since Mar 28, 2022

Federal due date Apr 18, 2022

EPSS, next 30 days

100%

Higher than 100% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

What CISA says to do

Apply updates per vendor instructions.

Affected products

Confluence Server, Confluence Data Center. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2021-26085 being exploited?

Yes. CISA added CVE-2021-26085 to its Known Exploited Vulnerabilities catalog on 2022-03-28, with a federal remediation due date of 2022-04-18. CISA lists it as used in ransomware campaigns.

How do I fix CVE-2021-26085?

CISA's required action: Apply updates per vendor instructions.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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