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ExploitedIn CISA KEVFix available

CVE-2021-26085

Exploitation confirmed. First attested on 2022-03-28 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2021-08-03
  • Fixed in7.12.3 · 7.4.10
  • WeaknessCWE-425

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-08-0300:15CVE publishedNVD
  2. 2021-10-05Exploit-DB entryExploit-DB
  3. 2022-03-28Added to the CISA KEV catalogCISA KEV
  4. 2022-03-28Listed as exploited by GCVEGCVE
  5. 2022-03-28Exploitation first reportedCISA KEV
  6. 2025-02-0712:29SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-26085?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-26085?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Atlassian Confluence
BranchAffectedFixed in
7.x≥ 7.5.0, < 7.12.37.12.3
7.4< 7.4.107.4.10
Atlassian Confluence
BranchAffectedFixed in
7.x≥ 7.5.0, < 7.12.37.12.3
7.4< 7.4.107.4.10

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As atlassian, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Atlassian Confluence Server
    Affected
    • < 7.4.10fixed in 7.4.10custom
    • = 7.5.0no fix statedcustom
    • < 7.12.3fixed in 7.12.3custom
  • Atlassian Confluence Data Center
    Affected
    • < 7.4.10fixed in 7.4.10custom
    • = 7.5.0no fix statedcustom
    • < 7.12.3fixed in 7.12.3custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-10-05

Fix

  1. Update Atlassian Confluence to 7.12.3 · 7.4.10
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-04-18

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-50377
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedColdFusionX/CVE-2021-26085
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-03-28
Patch Due Date
2022-04-18
Ransomware Use
Known
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published
2021-08-03
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-8mjc-qhq2-3xm8

Frequently asked questions

What is 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 version 7.5.0 before 7.12.3.

Is CVE-2021-26085 actively exploited?

Yes. CVE-2021-26085 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-04-18.

What is the CVSS score for CVE-2021-26085?

CVE-2021-26085 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

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