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Fencer Vulns
medium 5.2

CVE-2023-30543 json

`chainId` may be outdated if user changes chains as part of connection in @web3-react

published 2023-04-17 3 y ago modified 2026-06-17 4 mo ago also GHSA-8pf3-6fgr-3g3g , EUVD-2023-1241

cvss
5.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

@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 In affected versions the `chainId` may be outdated if the user changes chains as part of the connection flow.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.

Patch / fix

  • npm @web3-react/coinbase-wallet 8.0.35-beta.0
  • npm @web3-react/eip1193 8.0.27-beta
  • npm @web3-react/metamask 8.0.30-beta.0
  • npm @web3-react/walletconnect 8.0.37-beta.0

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:L
NVD 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
GitHub 3.1 5.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:L

Affected packages

ecosystem package affected fixed in
npm @web3-react/coinbase-wallet
>=6.0.0, <8.0.35-beta.0
8.0.35-beta.0
npm @web3-react/eip1193
>=6.0.0, <8.0.27-beta
8.0.27-beta
npm @web3-react/metamask
>=6.0.0, <8.0.30-beta.0
8.0.30-beta.0
npm @web3-react/walletconnect
>=6.0.0, <8.0.37-beta.0
8.0.37-beta.0

Affected products

  • Uniswap web3-react

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.