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0xCERT Security Advisory 0xCERT-2026-0348
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Advisory-ID:  0xCERT-2026-0348
Severity:     Medium
Published:    2026-11-13T00:00:00.000Z
Updated:      2026-11-14T07:23:32.396Z
Chains:       Other / Multi-chain
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0348

Title: MANTRA Web3Auth Key Compromise

Summary
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A Web3Auth vulnerability exposed private keys for Keplr social-login wallets, letting attackers drain liquid balances and force-unbond staked OM on MANTRA Chain.

Details
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Summary
A Web3Auth vulnerability exposed private keys for Keplr social-login wallets, letting attackers drain liquid balances and force-unbond staked OM on MANTRA Chain.

Incident
- - Victim: MANTRA
- - Date (UTC): 2026-11-13
- - Chain(s): MANTRA Chain
- - Attack type: private key compromise
- - Funds status: stolen

Recommended actions
- - If you use MANTRA, move funds to a fresh wallet with a new seed phrase once the vendor confirms the root cause
- - Update the wallet software only from official sources
- - Beware of follow-on phishing: ignore unofficial "refund", "recovery", or "claim" links and DMs; use the project's verified channels only

Source & attribution
Full analysis on Blockchain Breaches, 0xCERT's incident archive: https://www.blockchainbreaches.com/en/breaches/mantra-2026. Primary sources: https://crypto-economy.com/mantra-suspends-unbonding-requests-for-7-days-following-security-breach/ ; https://www.brinztech.com/breach-alerts/brinztech-alert-mantra-chain-reports-ongoing-web3auth-and-keplr-key-exploit-driving-unauthorized-token-unbonding ; https://www.kucoin.com/news/flash/mantra-suspends-unbonding-for-7-days-due-to-keplr-private-key-vulnerability.

References
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- - https://www.blockchainbreaches.com/en/breaches/mantra-2026
- - https://crypto-economy.com/mantra-suspends-unbonding-requests-for-7-days-following-security-breach/
- - https://www.brinztech.com/breach-alerts/brinztech-alert-mantra-chain-reports-ongoing-web3auth-and-keplr-key-exploit-driving-unauthorized-token-unbonding
- - https://www.kucoin.com/news/flash/mantra-suspends-unbonding-for-7-days-due-to-keplr-private-key-vulnerability

Verify with the 0xCERT OpenPGP key: https://www.0xcert.com/pgp.asc
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