Polymarket Hit by Massive Hack

Nearly 1,000 Polymarket accounts have reportedly been drained in a massive security breach, with hackers stealing more than $2.6 million.

Alex Dovbnya · 29 Oct 2026 · 5 min read

Wire content from U.Today

Polymarket Hit by Massive Hack

News

By
Alex Dovbnya

Thu, 29/10/2026 – 19:01

Nearly 1,000 Polymarket accounts have reportedly been drained in a massive security breach, with hackers stealing more than $2.6 million.

Polymarket Hit by Massive Hack

Cover image via depositphotos.com

How did the attack happen?
Another massive Polymarket hack
Polymarket reacts to a massive hack

A massive security breach has reportedly seen nearly 1,000 accounts on the crypto-based prediction market Polymarket drained, with the attack leading to losses of more than $2.6M.

Blockchain analyst Conor Grogan revealed that a total of 995 accounts were hit by the attack, resulting in losses of roughly $2.65 million.

Polymarket has seen 995 accounts drained by a hacker, for $2,654,211.42. Largest losses were 341k and 307k

Hacker has converted all funds to POL (most likely to avoid freezing) https://t.co/PjT2QhgBSa

HOT Stories

$342 Million Crypto Bloodbath as Bitcoin and XRP Longs Smashed: Main Crypto News This Morning

Near Protocol (NEAR), Shiba Inu (SHIB), Chainlink (LINK) and Ethereum (ETH) Price Analysis for October 29: Will the Market Dodge a Bullet?

— Conor (@jconorgrogan) October 29, 2026

The two biggest losses detected by Grogan were $341K and $307K.

Moreover, the analyst also revealed that the attacker has converted all stolen funds into Polygon’s native token (POL). This move might have been made to avoid having the funds frozen.

How did the attack happen?

As noted by blockchain investigator StarPlatinum, the attacker stole roughly $2.68M in just one hour.

The data shows that at about 17:05 UTC, an empty wallet began receiving funds.

At 17:25 UTC, the wallet had amassed roughly $412K.

However, the figure jumped to $2.02M at 17:50 UTC and reached roughly $2.68M at 18:05 UTC.

In total, the attacker has amassed some 28.6M POL tokens, as noted.

So far, it appears that the attack might have occurred due to a hack of a third-party JavaScript component that was embedded in the Polymarket website.

Another massive Polymarket hack

It’s not the first time that the popular prediction market has faced a massive hack leading to a multimillion-dollar security breach.

We’ve identified & fixed an issue impacting our international platform, Polymarket⁠.com. One of our 3rd party providers was compromised, and we have referred this to relevant law enforcement.

Anyone who has been impacted will be made whole.

Out of an abundance of caution, we have temporarily halted trading & are working to bring the platform back online.

— Polymarket Traders (@PolymarketTrade) October 29, 2026

In June, Polymarket also faced a similar hack. The attack happened when hackers compromised a third-party vendor and injected malicious JavaScript into the frontend of Polymarket.

In total, some $2.94 million was stolen from at least 11 wallets.