{"id":"CVE-2026-117603","title":"Electrum before 4.7.2 Nostr Wallet Connect Plugin Daily Spending Limit Bypass","summary":"Electrum before 4.7.2 contains a spending limit bypass vulnerability in the Nostr Wallet Connect plugin that allows malicious NWC clients to exceed daily_limit_sat by exploiting non-atomic budget checks and millisatoshi truncation. Attac…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-367"],"vendor":"spesmilo","product":"electrum","affected":["electrum < 4.7.2"],"published":"2026-10-27","updated":"2026-10-27","sourceUpdated":"2026-10-27T13:09:52.728Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-117603","references":[{"url":"https://github.com/spesmilo/electrum/security/advisories/GHSA-q7m2-785w-r585","label":"GitHub Security Advisory (GHSA-q7m2-785w-r585)"},{"url":"https://github.com/spesmilo/electrum/commit/5222374046d2a92da371d46c79ce0e61e7e2a42d","label":"Patch Commit"},{"url":"https://github.com/spesmilo/electrum/commit/3956bff0684f6060fbe8c823c3ee921928cdcaa5","label":"Patch Commit"},{"url":"https://www.vulncheck.com/advisories/electrum-before-4.7.2-nostr-wallet-connect-plugin-daily-spending-limit-bypass","label":"VulnCheck Advisory: Electrum before 4.7.2 Nostr Wallet Connect Plugin Daily Spending Limit Bypass"}],"tags":["cve.org"],"ingestedAt":"2026-10-27T16:11:59.340Z","slug":"CVE-2026-117603","body":"## Overview\n\nElectrum before 4.7.2 contains a spending limit bypass vulnerability in the Nostr Wallet Connect plugin that allows malicious NWC clients to exceed daily_limit_sat by exploiting non-atomic budget checks and millisatoshi truncation. Attackers can send concurrent pay_invoice requests that pass budget_allows_spend() before add_to_budget() runs, or repeatedly pay msat amounts that are floored to whole satoshis, to drain funds beyond the limit.\n\n## Affected\n\n- `electrum < 4.7.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}