EnergizeLab Eilik NestJS auth service: Account takeover via mass assignment
Summary
The EnergizeLab Eilik NestJS authentication service accepts a user-controlled user ID in account update requests (mass assignment, CWE-639). A registered user can set another account's identifier and take over that account, including its personal data and settings. The attack requires only a free registered account and no user interaction, and the affected component runs on the vendor's cloud infrastructure.
Affected
- EnergizeLab NestJS auth service, version 1.8.2 (per CNA record)
- All other versions are listed as unaffected by default; whether other builds are affected is unknown.
Fixed in
Unknown. No fixed version has been published.
Workaround
Unknown. No vendor workaround is published. Customers cannot patch the vendor-hosted service.
Exploitation
- Exploited in the wild: no evidence found.
- CISA SSVC: exploitation none, automatable no.
- Public proof of concept: reportedly available in the researcher's repository; not verified for this specific CVE.
- CVSS 3.1 8.8 (CNA); VulDB rates it 6.3 and CWE-915, so the score is disputed.
Our recommendation
- Use a unique, strong password for each Eilik account and enable any available account protections.
- Review which robots and accounts are linked to business use and remove unused accounts.
- Monitor for unexpected account changes and treat business-related Eilik accounts as high priority.
- Ask the vendor for a fix timeline and advisory.
- If Eilik robots are not used on business premises or with business data, the business risk is low.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- GitHub: your-secrets-are-safe-with-me (researcher repository) github.com
- takeonme.org: Multiple EnergizeLab Eilik/EilikO platform vulnerabilities takeonme.org
- OpenCVE: CVE-2026-105040 app.opencve.io
- ThreatInt: CVE-2026-105040 cve.threatint.com
- VulDB: 420904 vuldb.com
- aegismgk: Eilik/EiliKO privacy flaw report aegismgk.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 16:30.
Original description (NVD)
The EnergizeLab Eilik NestJS auth service accepts a user-controlled user ID in account update requests (mass assignment). A registered user can set another account's identifier and take over that account.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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