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Actively exploitedKnown ransomware use

CVE-2022-26134 Atlassian Confluence Server and Data Center Remote Code Execution Vulnerability

Atlassian Confluence Server and Data Center contain a remote code execution vulnerability that allows for an unauthenticated attacker to perform remote code execution.

From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.

Our Assessment

Should You Worry?

Patch nowCybergen assessment
  • CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 2 Jun 2022.
  • CISA lists it as known to be used in ransomware campaigns.
  • Rated Critical severity (CVSS 9.8, scored by CISA).
  • This product type is often exposed to the internet, which is where attackers scan for it first.
  • It has been in the catalogue for 1,618 days. Systems still unpatched now have almost certainly been scanned for it.
The Vulnerability

What It Is

In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are from 1.3.0 before 7.4.17, from 7.13.0 before 7.13.7, from 7.14.0 before 7.14.3, from 7.15.0 before 7.15.2, from 7.16.0 before 7.16.4, from 7.17.0 before 7.17.4, and from 7.18.0 before 7.18.1.

Affected Versions

ProductVersions
Atlassian Confluence Data Centernext of 1.3.0 to before unspecified
unspecified to before 7.4.17
7.13.0 to before unspecified
unspecified to before 7.13.7
7.14.0 to before unspecified
unspecified to before 7.14.3
Atlassian Confluence Servernext of 1.3.0 to before unspecified
unspecified to before 7.4.17
7.13.0 to before unspecified
unspecified to before 7.13.7
7.14.0 to before unspecified
unspecified to before 7.14.3

From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.

From Watch to Action

What To Do Now

  1. 1

    Find it

    Search your asset inventory and external attack surface for Atlassian Confluence Server/Data Center. Include cloud images, appliances and anything a supplier runs for you.

    Attack Surface Management
  2. 2

    Fix it

    Immediately block all internet traffic to and from affected products AND apply the update per vendor instructions [https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html] OR remove the affected products by the due date on the right. Note: Once the update is successfully deployed, agencies can reassess the internet blocking rules.

    Vulnerability Management
  3. 3

    Hunt for compromise

    If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.

    Incident Response
  4. 4

    Prove it is fixed

    Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.

    Penetration Testing

Vendor Advisories

Regulation

The Compliance Clock

Cyber EssentialsRated critical, so if it affects devices in your Cyber Essentials scope, the update must be installed within 14 days of the vendor releasing it.NIS2If exploitation causes a significant incident, essential and important entities owe their CSIRT an early warning within 24 hours and a notification within 72 hours.DORAFinancial entities must classify ICT incidents and send an initial notification for a major incident within strict deadlines, with exploited flaws a common cause.US federal (BOD 22-01)Federal civilian agencies had until 6 Jun 2022 to remediate. A sensible benchmark for everyone else.

General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.

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CVE-2026-21589Atlassian Multiple Products Files or Directories Accessible to External Parties VulnerabilityAdded 15 Oct 2026CVE-2021-26086Atlassian Jira Server and Data Center Path Traversal VulnerabilityAdded 12 Nov 2024CVE-2023-22527 · RansomwareAtlassian Confluence Data Center and Server Template Injection VulnerabilityAdded 24 Jan 2024CVE-2023-22518 · RansomwareAtlassian Confluence Data Center and Server Improper Authorization VulnerabilityAdded 7 Nov 2023CVE-2023-22515 · RansomwareAtlassian Confluence Data Center and Server Broken Access Control VulnerabilityAdded 5 Oct 2023CVE-2022-36804Atlassian Bitbucket Server and Data Center Command Injection VulnerabilityAdded 30 Sep 2022

All 14 exploited Atlassian vulnerabilities

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Evidence

Sources

  1. CISA Known Exploited Vulnerabilities catalogue
  2. NVD: CVE-2022-26134
  3. CVE record: CVE-2022-26134
  4. FIRST EPSS
  5. jira.atlassian.com/browse/CONFSERVER-79016
  6. packetstormsecurity.com/files/167432/Confluence-OGNL-Injection-Proof-Of-Concept.html
  7. packetstormsecurity.com/files/167430/Confluence-OGNL-Injection-Remote-Code-Execution.html
  8. packetstormsecurity.com/files/167431/Through-The-Wire-CVE-2022-26134-Confluence-Proof-Of-Concept.htm
  9. packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html
  10. confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html