Confluence Data Center RCE Patched
CERT-FR advises a remote code execution vulnerability in Atlassian Confluence Data Center before version 9.2.28, patch available.
Sourcecert.cyber.gouv.fr — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
CERT-FR issued an advisory regarding CVE-2026-90436, a vulnerability affecting Atlassian Confluence Data Center versions prior to 9.2.28. The flaw allows an attacker to achieve arbitrary remote code execution, though the advisory does not specify the attack vector or preconditions required for exploitation, nor does it indicate whether the vulnerability is currently being exploited in the wild.
Atlassian has published a security bulletin alongside the CVE disclosure, and organizations running affected Confluence Data Center deployments should apply the vendor patch to version 9.2.28 or later as soon as possible. No indicators of compromise, threat actor attribution, or specific exploitation details are provided in this advisory; it serves primarily as a notification to apply available fixes.
Mentioned in this report
Detection guidance
Confluence Java/Tomcat Process Spawning Shell or LOLBin (Windows)
A behavioural hunt for the technique in general, not a signature for the CVEs this report names.
Detects the Confluence Java/Tomcat process spawning a command interpreter or download utility, a common post-exploitation pattern for Confluence server-side RCE such as CVE-2026-90436. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.
title: Confluence Java/Tomcat Process Spawning Shell or LOLBin (Windows)
description: Detects the Confluence Java/Tomcat process spawning a command interpreter
or download utility. The report gives no exploitation details, so this is a generic
post-exploitation detection for Confluence RCE, not specific to CVE-2026-90436.
tags:
- attack.initial-access
- attack.t1190
- attack.execution
- attack.t1059
logsource:
category: process_creation
product: windows
detection:
selection_parent:
ParentImage|endswith:
- \java.exe
- \tomcat9.exe
ParentCommandLine|contains: confluence
selection_child:
Image|endswith:
- \cmd.exe
- \powershell.exe
- \pwsh.exe
- \wscript.exe
- \cscript.exe
- \mshta.exe
- \certutil.exe
- \bitsadmin.exe
- \whoami.exe
- \net.exe
- \net1.exe
condition: selection_parent and selection_child
falsepositives:
- Confluence admin scripts or plugins that deliberately shell out from the application
JVM
- Backup or maintenance jobs launched by the Confluence service wrapper
level: high
id: 8c325c44-7c2f-5df6-ba5a-2d73b140f77a
status: experimental
author: Vorant
references:
- https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1492
Confluence Java Process Spawning Shell (Linux)
A behavioural hunt for the technique in general, not a signature for the CVEs this report names.
Detects the Confluence JVM on Linux spawning a shell or download tool, indicating possible exploitation of a Confluence RCE. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.
title: Confluence Java Process Spawning Shell (Linux)
description: Detects the Confluence JVM on Linux spawning a shell, download tool or
recon utility. Generic post-exploitation detection for Confluence RCE, not tied
to specific exploit details because the advisory gives none.
tags:
- attack.initial-access
- attack.t1190
- attack.execution
- attack.t1059.004
logsource:
category: process_creation
product: linux
detection:
selection_parent:
ParentImage|endswith: /java
ParentCommandLine|contains:
- confluence.home
- atlassian/confluence
selection_child:
Image|endswith:
- /bash
- /sh
- /dash
- /zsh
- /curl
- /wget
- /nc
- /ncat
- /whoami
condition: selection_parent and selection_child
falsepositives:
- Confluence plugins or admin scripts that intentionally invoke shell commands from
the JVM
- Startup or maintenance wrappers that run through the Confluence JVM
level: high
id: 75e2a55f-6b28-5f3e-8c20-eb12da34f99e
status: experimental
author: Vorant
references:
- https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1492
Behavioural rules are generated from public reporting — validate in your environment before deploying.
Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1492
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