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Atlassian released fixes for CVE-2023-22527, a critical template-injection vulnerability in Confluence Data Center and Confluence Server that enables an unauthenticated attacker to execute arbitrary code remotely. The flaw has a CVSS score of 10.0, affects Confluence 8.0.x through 8.4.x and 8.5.0 through 8.5.3, and public proof-of-concept exploit code is available; internet-exposed instances face the greatest risk.
Organizations should immediately upgrade affected deployments to Confluence 8.5.4, 8.6.0, or 8.7.1 as applicable, and apply Atlassian’s associated security mitigations. The Dutch NCSC assessed the issue as High/High for exploitation likelihood and impact, underscoring the need to identify exposed vulnerable servers, patch them urgently, and review systems for signs of compromise.
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3 events from the most recent confirmed update back to the earliest known activity.
Atlassian issued security updates for CVE-2023-22527, a CVSS 10.0 unauthenticated template-injection flaw that permits remote arbitrary code execution in vulnerable Confluence Data Center and Server deployments. Affected releases include Confluence 8.0.x through 8.4.x and 8.5.0 through 8.5.3; fixed versions include 8.5.4, 8.6.0, and 8.7.1.
The Dutch NCSC raised its assessment of CVE-2023-22527 to High/High, citing a high likelihood of exploitation and high potential impact. The Digital Trust Center urged organizations to promptly implement Atlassian's recommended mitigations.
Public proof-of-concept code demonstrating exploitation of CVE-2023-22527 became available, increasing the risk to internet-exposed vulnerable Confluence instances.
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Attackers rapidly began exploiting **CVE-2023-22527**, a critical `CVSS 10.0` remote code execution flaw in **Atlassian Confluence Data Center and Confluence Server**, within days of public disclosure. The vulnerability affects outdated Confluence 8 releases issued before December 5, 2023, as well as version `8.4.5`, and stems from **OGNL expression injection** that can let unauthenticated attackers execute arbitrary code on exposed servers. Telemetry from Shadowserver Foundation and The DFIR Report recorded nearly **40,000 exploitation attempts** over three days from more than **600 unique IP addresses**, indicating broad opportunistic scanning across the internet. Observed activity included callback testing and basic reconnaissance such as running `whoami`, suggesting attackers were validating access for potential follow-on compromise; at the time, more than **11,000 Atlassian instances** were internet-accessible, underscoring the exposure risk for unpatched organizations.
Aug 15, 2026
Atlassian published security advisory `AV26-731` covering multiple vulnerabilities, including some rated **critical**, across a broad set of products used in data center, server, and desktop environments. Affected product lines named in follow-on notices include **Bamboo, Bitbucket, Confluence, Crowd, Fisheye/Crucible, Jira, Jira Service Management, and Sourcetree** for Mac and Windows, and government guidance urged administrators to review the advisories and apply vendor updates. One of the disclosed issues, `CVE-2026-21579`, is a high-severity **information disclosure** flaw in **Atlassian Confluence Data Center** with a CVSS 4.0 score of **8.2**. Atlassian said the vulnerability can be exploited remotely by an **unauthenticated** attacker to access sensitive information, affects multiple Confluence Data Center release lines, and is fixed in supported versions including **9.2.22 or later** and **10.2.14 or later**; customers were advised to upgrade to the latest or patched supported releases.
Jul 24, 2026
Atlassian and Finland’s National Cyber Security Centre warned of multiple severe vulnerabilities in Atlassian products, led by **`CVE-2022-1471`**, a critical SnakeYAML deserialization flaw rated **CVSS 9.8** that can enable remote code execution across **Bitbucket, Confluence, Jira Core, Jira Software, Jira Service Management, Automation for Jira,** and the **Confluence Cloud Migration App**. Atlassian said its hosted **`atlassian.net`** cloud sites are not affected, but Data Center and Server deployments face broad exposure and should be upgraded immediately to fixed releases. The advisories also identified product-specific RCE issues in **Confluence Data Center and Server** (**`CVE-2023-22522`**), the **Assets Discovery** app (**`CVE-2023-22523`**), and **Atlassian Companion App for macOS** (**`CVE-2023-22524`**). Authorities urged organizations to install patched versions without delay and, where patching cannot be completed at once, remove vulnerable services from the public internet; Atlassian added that there is no mitigation for some affected products, while certain Jira and Jira Service Management environments can reduce risk by upgrading the **Automation for Jira** app to a fixed version.
Jun 29, 2026