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SecurityQuiet 13d · day 13

Polymarket users report stolen funds in second vendor-blamed hack

Prediction market platform Polymarket faces a new exploit months after a similar frontend attack, and again pledges to reimburse users.

newest coverage 12d agosummary written 12d ago5 pieces MastodonNewswiresReddit

What to know

  • Polymarket users reported funds stolen from their wallets on October 29, 2026, in what is described as the platform's second such exploit this year.
  • Polymarket has again attributed the breach to a compromised third-party vendor, as it did after a June 2026 incident that cost users nearly $3 million.
  • Polymarket has indicated it will reimburse affected users, consistent with its response to the earlier June incident.
  • Scale and technical details of the October incident are not yet specified in available reporting.

Polymarket Prediction market platform

How it unfolded 3 developments, newest first · click a bar or a number to jump articlesposts

Peak 2 pieces in 3h at Oct 29, 5 PM; 5 pieces over 13 days (1 article · 2 posts · 2 comments) Oct 29, 5 PM — 2 pieces · 1 article · 1 post — Mastodon 1, Newswires 1Oct 29, 8 PM — quietOct 29, 11 PM — 1 piece · 1 post — Reddit 1Oct 30, 2 AM — 1 piece · 1 comment — Reddit 1Oct 30, 5 AM — 1 piece · 1 comment — Reddit 1Oct 30, 8 AM — quietOct 30, 11 AM — quietOct 30, 2 PM — quietOct 30, 5 PM — quietOct 30, 8 PM — quietOct 30, 11 PM — quietOct 31, 2 AM — quietOct 31, 5 AM — quietOct 31, 8 AM — quietOct 31, 11 AM — quietOct 31, 2 PM — quietOct 31, 5 PM — quietOct 31, 8 PM — quietOct 31, 11 PM — quietNov 1, 1 AM — quietNov 1, 4 AM — quietNov 1, 7 AM — quietNov 1, 10 AM — quietNov 1, 1 PM — quietNov 1, 4 PM — quietNov 1, 7 PM — quietNov 1, 10 PM — quietNov 2, 1 AM — quietNov 2, 4 AM — quietNov 2, 7 AM — quietNov 2, 10 AM — quietNov 2, 1 PM — quietNov 2, 4 PM — quietNov 2, 7 PM — quietNov 2, 10 PM — quietNov 3, 1 AM — quietNov 3, 4 AM — quietNov 3, 7 AM — quietNov 3, 10 AM — quietNov 3, 1 PM — quietNov 3, 4 PM — quietNov 3, 7 PM — quietNov 3, 10 PM — quietNov 4, 1 AM — quietNov 4, 4 AM — quietNov 4, 7 AM — quietNov 4, 10 AM — quietNov 4, 1 PM — quietNov 4, 4 PM — quietNov 4, 7 PM — quietNov 4, 10 PM — quietNov 5, 1 AM — quietNov 5, 4 AM — quietNov 5, 7 AM — quietNov 5, 10 AM — quietNov 5, 1 PM — quietNov 5, 4 PM — quietNov 5, 7 PM — quietNov 5, 10 PM — quietNov 6, 1 AM — quietNov 6, 4 AM — quietNov 6, 7 AM — quietNov 6, 10 AM — quietNov 6, 1 PM — quietNov 6, 4 PM — quietNov 6, 7 PM — quietNov 6, 10 PM — quietNov 7, 1 AM — quietNov 7, 4 AM — quietNov 7, 7 AM — quietNov 7, 10 AM — quietNov 7, 1 PM — quietNov 7, 4 PM — quietNov 7, 7 PM — quietNov 7, 10 PM — quietNov 8, 1 AM — quietNov 8, 4 AM — quietNov 8, 7 AM — quietNov 8, 10 AM — quietNov 8, 1 PM — quietNov 8, 4 PM — quietNov 8, 7 PM — quietNov 8, 10 PM — quietNov 9, 1 AM — quietNov 9, 4 AM — quietNov 9, 7 AM — quietNov 9, 10 AM — quietNov 9, 1 PM — quietNov 9, 4 PM — quietNov 9, 7 PM — quietNov 9, 10 PM — quietYesterday, 1 AM — quietYesterday, 4 AM — quietYesterday, 7 AM — quietYesterday, 10 AM — quietYesterday, 1 PM — quietYesterday, 4 PM — quietYesterday, 7 PM — quietYesterday, 10 PM — quietToday, 1 AM — quietToday, 4 AM — quietToday, 7 AM — quietToday, 10 AM — quietToday, 1 PM — quietToday, 4 PM — quietToday, 7 PM — quiet 1–3
Oct 30Oct 31Nov 1Nov 2Nov 3Nov 4Nov 5Nov 6Nov 7Nov 8Nov 9yesterdaynow · 9:14 PM ET
  1. 3

    Report of the hack circulates on Reddit

    The Cyber Security News report on the Polymarket hack is reposted and discussed on Reddit.

    • Coldhard for offline wallets is akin to Proven Industries for IRL padlocks. I’d still attempt to secure my coin offline in most instances. Traditionally hardware wallets are way more secure than keeping your coin hosted in some 3rd party online exchange service.

      PrinceSmolr/technology12d agoview on r/technology ↗
    1 more of the top 2 · 2 posts in this stretch

    • The newer models are much stronger with legacy languages, Anthropic has made a point to improve that too

      Equivalent-Fan-2557r/technology12d agoview on r/technology ↗
    all of them →
  2. 2

    Cyber Security News reports Polymarket hack and user fund losses

    Cyber Security News publishes a report titled "Polymarket Hacked - Users Reported Funds Stolen From Their Wallets," documenting the incident.

    1. 1 outlet Polymarket Hacked - Users Reported Funds Stolen From Their Wallets

      first by Cyber Security News, 13d ago

  3. 1

    Polymarket users lose funds again in second vendor-linked exploit

    Polymarket users reported wallet funds stolen in what is described as the second exploit the platform has blamed on a third-party vendor; Polymarket has said it will again reimburse user losses.

    “This is the second time Polymarket users have lost funds due to exploits Polymarket has blamed on third-party vendors.”
    — web3isgoinggreat
    • web3isgreat@indieweb.social

      Polymarket users' funds stolen, again October 29, 2026 https://www. web3isgoinggreat.com/?id=polym arket-vendor-exploit-2

      web3isgreat@indieweb.socialMastodon13d agoview on Mastodon ↗
  4. background

    Malicious frontend script steals nearly $3M from Polymarket users — A malicious script injected into Polymarket's frontend led to customers losing almost $3 million; Polymarket attributed the breach to a third-party vendor and reimbursed affected users.

What people are saying 0 voices from 0 sites · best of 3 · verbatim