{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/vendors/electrum/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":["cpe:2.3:a:electrum:electrum:*:*:*:*:*:*:*:*"],"_cs_cves":[{"cvss":7.5,"id":"CVE-2026-117601"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Electrum (\u003c 4.8.3)"],"_cs_severities":["high"],"_cs_tags":[],"_cs_type":"advisory","_cs_vendors":["Electrum"],"content_html":"\u003cp\u003eElectrum versions before 4.8.3 contain a vulnerability (CVE-2026-117601) where the client fails to verify the signatures of wallet-owned inputs for transactions residing in the unconfirmed mempool. This flaw allows a malicious server to intercept and replace a broadcast transaction with a conflicting one.\u003c/p\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eAttackers can manipulate the user's view of pending transactions, suppressing the original broadcast and presenting a modified, invalid zero-fee version that pays an attacker-controlled address. By presenting this as a transaction that requires an RBF (Replace-By-Fee) bump, the attacker tricks the user into signing a transaction that transfers funds to the attacker.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade Electrum clients to version 4.8.3 or later on all systems where the wallet software is installed.\u003c/li\u003e\n\u003cli\u003eUntil patching is complete, verify all RBF requests against the intended recipient address and fee structure before signing transactions.\u003c/li\u003e\n\u003cli\u003eFor enterprise or high-value environments, isolate Electrum instances to connect only to trusted, verified Electrum servers rather than relying on auto-discovered or public nodes.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-10-27T15:50:58Z","date_published":"2026-10-27T15:50:58Z","id":"https://feed.craftedsignal.io/briefs/2026-10-electrum-sig-verification/","summary":"Electrum versions prior to 4.8.3 fail to verify signatures of wallet-owned inputs in unconfirmed transactions, allowing malicious servers to trick users into signing fraudulent fee-replacement transactions.","title":"Electrum: Unverified signature vulnerability in mempool transactions (CVE-2026-117601)","url":"https://feed.craftedsignal.io/briefs/2026-10-electrum-sig-verification/"}],"language":"en","title":"CraftedSignal Threat Feed - Electrum","version":"https://jsonfeed.org/version/1.1"}