CVE-2023-22527: Atlassian Confluence Data Center and Server

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

Yes, if you run Atlassian Confluence Data Center and Server. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-01-24, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-02-14; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns.
EPSS 100.0%, percentile 100.0: FIRST’s model estimates a 100.0% chance of exploitation activity in the next 30 days, higher than 100.0% of all scored CVEs (very high). EPSS is a probability, not a verdict.
Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

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.

CISA’s summary

Atlassian Confluence Data Center and Server contain an unauthenticated OGNL template injection vulnerability that can lead to remote code execution.

Weakness type: CWE-74.

Product: Atlassian Confluence Data Center and Server · Assigned by: atlassian · Published: 2024-01-16

Affected and fixed versions

Vendor	Product	Affected versions (per CVE record)
Atlassian	Confluence Data Center	>= 8.0.0, >= 8.1.0, >= 8.2.0, >= 8.3.0, >= 8.4.0, >= 8.5.0, >= 8.5.1, >= 8.5.2, >= 8.5.3
Atlassian	Confluence Server	>= 8.0.0, >= 8.1.0, >= 8.2.0, >= 8.3.0, >= 8.4.0, >= 8.5.0, >= 8.5.1, >= 8.5.2, >= 8.5.3

Severity scores

Scored by	CVSS	Score	Vector
atlassian	3.0	10 Critical	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`

Attack vector: network (remotely reachable)
Attack complexity: low
Privileges required: none (no login)
User interaction: none
Scope: changed (can affect other components)

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

CISA KEV: added 2024-01-24; federal due date 2024-02-14. Known ransomware use: Known.
CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA SSVC assessment: exploitation active, automatable yes, technical impact total.
FIRST EPSS (model of 2026-10-21): 99.98% probability of exploitation activity in the next 30 days; percentile 100.0.

Timeline

2024-01-16 — CVE record published by atlassian
2024-01-24 — Added to CISA’s Known Exploited Vulnerabilities catalog
2024-02-14 — CISA remediation deadline for US federal agencies
2025-10-21 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Other references from the CVE record and advisory

confluence.atlassian.com confluence.atlassian.com
jira.atlassian.com jira.atlassian.com
packetstormsecurity.com packetstormsecurity.com
vicarius.io vicarius.io

All exploited Atlassian vulnerabilities · Today’s Security Digest