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Unlock with Pro - from £29/user/moDetect Pterodactyl Wings Egg Configuration-File Templating Node Secret Exposure (CVE-2026-52855) in Splunk
Detects exploitation of CVE-2026-52855, a critical (CVSS 9.9) information disclosure vulnerability in Pterodactyl Wings prior to 1.12.3. The Wings daemon's egg configuration-file templating engine fails to properly scope variable substitution, allowing a malicious or crafted egg/server configuration to reference and render node-level secrets (e.g., the Wings daemon token, SFTP credentials, Docker/panel authentication secrets) into server-accessible configuration files. An attacker with the ability to create or modify an egg (via panel admin compromise, supply-chain egg import, or a malicious server owner in multi-tenant environments) can exfiltrate node configuration secrets, leading to full node takeover. Detection focuses on Wings daemon logs showing configuration-file template rendering events that reference sensitive node config keys, unexpected egg install/import activity, and outbound access to rendered server config files containing daemon secrets.
MITRE ATT&CK
SPL Detection Query
index=wings sourcetype=wings:daemon ("config-file" OR "egg" OR "template")
("config.token" OR "daemon_token" OR "docker.socket" OR "sftp.password" OR "authentication_token" OR "panel_secret")
| eval node=coalesce(node_name, host)
| stats count min(_time) as first_seen max(_time) as last_seen by node, server_uuid, user
| where count > 0
| sort - last_seenSearches Wings daemon logs indexed in Splunk for egg configuration-file template rendering events referencing node secret keys, a strong indicator of CVE-2026-52855 exploitation attempts.
Data Sources
Required Sourcetypes
False Positives & Tuning
- Egg developers testing templates in a staging node with verbose debug logging enabled
- CI/CD egg validation jobs rendering configs for automated tests
Other platforms for CVE-2026-52855
Testing Methodology
Validate this detection against 3 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Simulate malicious egg config_files template referencing secret key
Expected signal: Wings daemon logs recording config-file template rendering for the test egg, including reference to the config.token variable
- Test 2Render server config and inspect for exposed daemon secret
Expected signal: File write event on server.properties under the server volume, plus Wings daemon log entry for config sync of the test server
- Test 3Verify unpatched Wings version is vulnerable
Expected signal: Command execution log/audit entry for the wings version check on the lab host
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