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VulnerabilityCVE-2023-22527Published 2024-01-16

CVE-2023-22527 — atlassian:confluence_server

criticalCISA KEVRansomwarePublic exploit11 PoC reposNuclei template

As of 2025-10-21, CVE-2023-22527 is a CRITICAL-severity vulnerability in atlassian:confluence_server, CVSS v3.1 9.8, EPSS 99.9% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-01-24), with a US federal remediation deadline of 2024-02-14, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2023-22527, most recently “APT35 (Charming Kitten) GCC Pre-Positioning Cyber Reconnaissance Campaign Enabling Kinetic Targeting”.

CVSS v3.1
9.8/10Critical
EPSS
99.9%Higher than 99.9% of scored CVEs
CISA KEV
ListedAdded · due 2024-02-14
Tracked threats
1Campaigns referencing it
Priority
10/10Threadlinqs triage score
Published
Updated 2025-10-21
CVSS v3.1 9.8 (CRITICAL) · EPSS 99.9% (higher than 99.9% of all scored CVEs) · Priority 10/10 · Published 2024-01-16

Last updated:

What is CVE-2023-22527?

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.

The record classifies CVE-2023-22527 under weakness class CWE-74. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1017 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
99.9% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
CISA KEV
Listed since 2024-01-24, federal remediation deadline 2024-02-14 — used in known ransomware campaigns
Threadlinqs priority
10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
Published
2024-01-16, last modified 2025-10-21

Is CVE-2023-22527 being exploited?

CISA added CVE-2023-22527 to the Known Exploited Vulnerabilities catalog on 2024-01-24, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2024-02-14 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2023-22527 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2023/CVE-2023-22527.yaml). It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.

Affected products and versions

  • (vendor unspecified): atlassian:confluence_server, atlassian:confluence_data_center

How to fix CVE-2023-22527

Because CVE-2023-22527 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2024-02-14. No vendor patch reference has been recorded for CVE-2023-22527 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2023-22527

1 tracked threat in the Threadlinqs corpus references CVE-2023-22527, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on .

Other references