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Actively exploitedKnown ransomware use

CVE-2023-22527 Atlassian Confluence Data Center and Server Template Injection Vulnerability

Atlassian Confluence Data Center and Server contain an unauthenticated OGNL template injection vulnerability that can lead to 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 24 Jan 2024.
  • CISA lists it as known to be used in ransomware campaigns.
  • Rated Critical severity (CVSS 10.0, scored by Vendor).
  • This product type is often exposed to the internet, which is where attackers scan for it first.
  • It has been in the catalogue for 1,017 days. Systems still unpatched now have almost certainly been scanned for it.
The Vulnerability

What It Is

A template injection vulnerability on older versions of Confluence Data Center and Server allows an unauthenticated attacker to achieve RCE on an affected instance. Customers using an affected version must take immediate action. Most recent supported versions of Confluence Data Center and Server are not affected by this vulnerability as it was ultimately mitigated during regular version updates. However, Atlassian recommends that customers take care to install the latest version to protect their instances from non-critical vulnerabilities outlined in Atlassian’s January Security Bulletin.

Affected Versions

ProductVersions
Atlassian Confluence Data Center>= 8.0.0
>= 8.1.0
>= 8.2.0
>= 8.3.0
>= 8.4.0
Atlassian Confluence Server>= 8.0.0
>= 8.1.0
>= 8.2.0
>= 8.3.0
>= 8.4.0

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 Data Center and Server. Include cloud images, appliances and anything a supplier runs for you.

    Attack Surface Management
  2. 2

    Fix it

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

    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 14 Feb 2024 to remediate. A sensible benchmark for everyone else.

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

Stay Ahead

More Exploited Atlassian Flaws

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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-2023-22518 · 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 2022CVE-2022-26138Atlassian Questions For Confluence App Hard-coded Credentials VulnerabilityAdded 29 Jul 2022

All 14 exploited Atlassian vulnerabilities

Not Sure If You Are Exposed?

Our attack surface and vulnerability teams can check your internet-facing estate for CVE-2023-22527 and every other exploited flaw on the list.

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Evidence

Sources

  1. CISA Known Exploited Vulnerabilities catalogue
  2. NVD: CVE-2023-22527
  3. CVE record: CVE-2023-22527
  4. FIRST EPSS
  5. confluence.atlassian.com/security/cve-2023-22527-rce-remote-code-execution-vulnerability-in-confluen
  6. confluence.atlassian.com/pages/viewpage.action?pageId=1333335615
  7. jira.atlassian.com/browse/CONFSERVER-93833
  8. packetstormsecurity.com/files/176789/Atlassian-Confluence-SSTI-Injection.html