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GHSA-fxc9-7j2w-vx54: mpp has multiple payment bypass and griefing vulnerabilities

March 29, 2026

Multiple vulnerabilities were discovered which allowed for undesirable behaviors, including:

  • Performing free tempo/charge requests
  • Replaying existing tempo/charge requests
  • Performing free tempo/session requests
  • Piggybacking off existing tempo/session channels
  • Griefing existing tempo/session channels
  • Manipulate the fee payer of a tempo/charge or tempo/session handler into paying for requests
  • Replaying existing stripe/charge requests

References

  • github.com/advisories/GHSA-fxc9-7j2w-vx54
  • github.com/tempoxyz/mpp-rs
  • github.com/tempoxyz/mpp-rs/releases/tag/v0.8.0
  • github.com/tempoxyz/mpp-rs/security/advisories/GHSA-fxc9-7j2w-vx54

Code Behaviors & Features

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Affected versions

All versions before 0.8.0

Fixed versions

  • 0.8.0

Solution

Upgrade to version 0.8.0 or above.

Impact 10 CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Learn more about CVSS

Weakness

  • CWE-288: Authentication Bypass Using an Alternate Path or Channel
  • CWE-294: Authentication Bypass by Capture-replay
  • CWE-345: Insufficient Verification of Data Authenticity

Source file

cargo/mpp/GHSA-fxc9-7j2w-vx54.yml

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