CVE-2026-106511 MultiversX Labs S.R.L. CVE debrief

Who should care

Defenders responsible for MultiversX's multisig-improved smart contract system, including developers, administrators, and security teams, should assess exposure and prioritize verification and remediation.

Why it matters

The vulnerability in MultiversX's multisig-improved smart contract system allows a Proposer to perform barred actions, including draining funds, which requires immediate attention from defenders to prevent potential loss of funds and compromise of smart contract integrity.

• Potential loss of funds due to unauthorized transactions
• Compromise of smart contract integrity
• Need for verification of affected versions and application of patches or compensating controls
• Potential reputational damage due to security incident

Technical summary

The multisig-improved smart contract system contains a vulnerability where a missing independent authorization check allows any account with the Proposer role to perform explicitly barred actions, including draining 100% of a contract's EGLD/ESDT balance in two transactions with zero signatures. This vulnerability is critical because it enables unauthorized transactions, potentially leading to significant financial losses and reputational damage. The technical impact is substantial, as it compromises the integrity of the smart contract system. Defenders should prioritize verifying affected versions and applying patches or compensating controls to prevent exploitation.

Defensive priority

Defenders should prioritize verifying the affected versions and applying patches or compensating controls to prevent exploitation.

Recommended defensive actions

• Verify the affected versions of the multisig-improved smart contract system
• Apply patches or compensating controls to prevent exploitation
• Monitor for suspicious transactions
• Review and update incident response plans
• Conduct a thorough review of smart contract configurations
• Implement additional security measures to detect and prevent unauthorized transactions
• Document and track remediation efforts for future reference

Evidence notes

The CVE record and source item provide details on the vulnerability, but limited information is available on affected versions and remediation. Further verification is needed to determine the scope of the vulnerability and apply appropriate patches or compensating controls. The lack of detailed information on affected versions and remediation strategies hinders defenders' ability to effectively mitigate the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.