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

- Exploited (CISA KEV): yes, added 2024-01-24, known ransomware use
- Published: 2024-01-16
- CVSS: 10 CRITICAL (v3.0)
- EPSS: 100.0% (100th percentile)
- CWE: CWE-74

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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | Before feed history | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2024-03-12 | 56 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### F5

- 2024-03-12 · new · rule 200104925
  > Added: signature 200104925 "Atlassian Confluence Remote Code Execution" (Server Side Code Injection, risk High), systems: Java Servlets/JSP. References: CVE-2023-22527.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2024-05-21 · new · rule 200104925
  > Added: signature 200104925 "Atlassian Confluence Remote Code Execution" (Server Side Code Injection, risk High), systems: Java Servlets/JSP. References: CVE-2023-22527.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: blocked (1 of 1 requests blocked), template CVE-2023-22527, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: blocked (1 of 1 requests blocked), template CVE-2023-22527, 2026-11-02

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2023-22527 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2023-22527