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TI-2026-81178 Aliases CVE-2026-117603GHSA-98mp-7r7x-725c

Spending limit bypass in Electrum Nostr Wallet Connect plugin

Priority LOW 39CWE-367Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Electrum before 4.7.2 is affected in its Nostr Wallet Connect plugin. A time-of-check to time-of-use race condition (CWE-367) and the flooring of millisatoshi amounts to whole satoshis let a malicious NWC client spend beyond the configured daily_limit_sat. An attacker using such a client can send concurrent pay_invoice requests or repeatedly pay small msat amounts to drain funds past the limit.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

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. 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00194 9th percentileScored 2026-11-07
Fix Fixed electrum (spesmilo): 4.7.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
spesmiloelectrumbefore 4.7.24.7.2Patch availableCNA
  • electrum Vendorspesmilo Affected before 4.7.2 Fixed in 4.7.2 Patch available CNA

Remediation

Upgrade Electrum to version 4.7.2 or later, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

  • Fix · CNA electrum (spesmilo) Fixed in 4.7.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    spesmilo electrum 4.7.2

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-81177 Electrum external plugin authorization bypass enables local code executionPriority LOW 38
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-27 Threatist record created from CVE-2026-117603
  2. 2026-10-27 Alias added: GHSA-98mp-7r7x-725c
  3. 2026-10-28 Priority changed: MEDIUM → LOW
  4. 2026-11-02 CISA SSVC decision points changed
  5. 2026-11-05 Affected versions changed · Red Hat
  6. 2026-11-05 CVSS score added · Red Hat

References

Patch 2

Advisory 1

  • TI-2026-81176 Missing signature verification of mempool transactions in Electrum CVSS 4.0CRITICAL 9.3
  • TI-2026-81177 Electrum external plugin authorization bypass enables local code execution CVSS 4.0HIGH 8.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences