$815K Stolen in Ethereum Alephium TokenBridge Exploit

Severity: High (Score: 66.0)

Sources: Pluang, Ambcrypto

Published: 2026-06-01 · Updated: 2026-06-01

Keywords: ethereum, minutes, exploit, alephium, tokenbridge, bitcoin, news

Summary

On June 1, 2026, attackers exploited the Alephium TokenBridge on the Ethereum network, resulting in the theft of $815,000 within just 7 minutes. The exploit involved the use of forged keys, allowing unauthorized access to the bridge's funds. This incident has raised significant concerns among users and investors in the Ethereum ecosystem. The attack highlights vulnerabilities in the bridge's security mechanisms, prompting calls for enhanced protective measures. Currently, the status of the stolen funds remains unclear, and investigations are ongoing to identify the perpetrators. The incident underscores the risks associated with decentralized finance (DeFi) platforms, particularly those involving cross-chain transactions. Key Points: • Attackers exploited the Alephium TokenBridge, stealing $815,000 in 7 minutes. • The exploit utilized forged keys to gain unauthorized access to the bridge's funds. • Ongoing investigations aim to identify the attackers and recover the stolen assets.

Detailed Analysis

**Impact** $815,000 was stolen within 7 minutes through an exploit targeting the Ethereum Alephium TokenBridge. The incident affects users of the TokenBridge service, which facilitates asset transfers between Ethereum and Alephium blockchains. No specific geographic or sectoral data is provided, but the loss impacts cryptocurrency holders and the DeFi ecosystem relying on cross-chain bridges. **Technical Details** Attackers exploited the TokenBridge by using forged keys to bypass authentication controls. The exploit occurred rapidly, indicating automated or scripted actions. No specific CVEs, malware, or infrastructure details are disclosed in the articles. The attack corresponds to the exploitation and lateral movement stages of the kill chain. **Recommended Response** Defenders should immediately review and strengthen key management and authentication mechanisms for cross-chain bridges. Monitoring for unusual token transfer patterns and rapid asset movements is critical. No patch or specific IOC information is available; therefore, continuous monitoring of bridge transactions and access logs is advised.

Source articles (2)

• $815K gone in 7 minutes – Inside Ethereum's Alephium TokenBridge exploit — Ambcrypto · 2026-06-01
  AMBCrypto was founded in 2018 with a mission to simplify and bring the latest blockchain and cryptocurrency news to our readers. We have quickly grown into the digital news source for an emerging gene…
• $815K stolen in 7 minutes as attackers exploit Ethereum Alephium TokenBridge with forged keys. — Pluang · 2026-06-01
  Leading cryptocurrencies like Bitcoin, Ethereum, XRP, and Dogecoin showed little movement as President Trump expressed no urgency to finalize an Iran deal, keeping market sentiment cautious. Bitcoin f…

Timeline

• 2026-06-01 — Alephium TokenBridge exploit occurs: Attackers used forged keys to steal $815,000 from the Ethereum-based Alephium TokenBridge in just 7 minutes.
• 2026-06-01 — Incident reported: Both AMBCrypto and Pluang reported the exploit on the same day, detailing the method and impact.

Related entities

• Data Breach (Attack Type)
• Iran (Country)
• Alephium (Platform)
• Ethereum (Company)