GHSA-fxc9-7j2w-vx54: Mpp Mpp Has Multiple Payment Bypass Vulnerability

CRITICAL
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CWE-294 CWE-345 CWE-288
Published
Advisory Summary

GHSA-fxc9-7j2w-vx54 is a CRITICAL mpp has multiple payment bypass vulnerability (CWE-294: Authentication Bypass by Capture-replay) affecting Mpp libraries in the crates.io ecosystem. The issue involves mpp has multiple payment bypass and griefing vulnerabilities. Remediation is available by upgrading affected packages to version 0.8.0.

GHSA-fxc9-7j2w-vx54 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-fxc9-7j2w-vx54
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-294: Authentication Bypass by Capture-replay
Affected Product Mpp
Package Ecosystem crates.io
Published Date
Last Updated

How to Fix GHSA-fxc9-7j2w-vx54

To remediate this vulnerability, upgrade all affected Mpp dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

mpp fixed: 0.8.0 
Upgrade mpp to 0.8.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for mpp

How to Check if You Are Affected

To determine whether your application is affected by GHSA-fxc9-7j2w-vx54, inspect your project dependencies for Mpp:

inspect dependencies for mpp

Analyze the terminal output to locate any version of Mpp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.8.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-294: Authentication Bypass by Capture-replay, where a capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). In Mpp, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact 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 ### Patches The issues are patched in 0.8.0 ### Workarounds There are no workarounds available for these vulnerabilities

GHSA-fxc9-7j2w-vx54 Affected Mpp Versions

1 component(s)
Fixed Versions:
0.8.0
Product / Package Ecosystem Affected Versions Fixed Version
mpp
 crates.io
< 0.8.0
0.8.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/tempoxyz/mpp-rs/security/advisories/GHSA-fxc9-7j2w-vx54
Mpp Source Repository REPOSITORY
https://github.com/tempoxyz/mpp-rs
Mpp Release RELEASE
https://github.com/tempoxyz/mpp-rs/releases/tag/v0.8.0

Frequently Asked Questions

What is GHSA-fxc9-7j2w-vx54?
GHSA-fxc9-7j2w-vx54 is a security vulnerability in Mpp involving mpp has multiple payment bypass and griefing vulnerabilities under CWE-294: Authentication Bypass by Capture-replay.
Which Mpp versions are affected?
Affected versions include releases prior to 0.8.0 across affected packages: mpp.
What version fixes GHSA-fxc9-7j2w-vx54?
Upgrading to 0.8.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mpp affected?
Yes, mpp is affected in releases prior to 0.8.0. Upgrade your dependency to 0.8.0 or later.
What CWE is associated with GHSA-fxc9-7j2w-vx54?
GHSA-fxc9-7j2w-vx54 is classified under CWE-294: Authentication Bypass by Capture-replay (A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).).
How can I check crates.io dependencies for GHSA-fxc9-7j2w-vx54?
Run the dependency tree command: 'inspect dependencies for mpp'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fxc9-7j2w-vx54",
  "modified" : "2026-03-29T15:20:45Z",
  "published" : "2026-03-29T15:20:45Z",
  "aliases" : [ ],
  "summary" : "mpp has multiple payment bypass and griefing vulnerabilities",
  "details" : "### Impact\nMultiple vulnerabilities were discovered which allowed for undesirable behaviors, including:\n- Performing free `tempo/charge` requests\n- Replaying existing `tempo/charge` requests\n- Performing free `tempo/session` requests\n- Piggybacking off existing `tempo/session` channels\n- Griefing existing `tempo/session` channels\n- Manipulate the fee payer of a `tempo/charge` or `tempo/session` handler into paying for requests\n- Replaying existing `stripe/charge` requests\n\n### Patches\nThe issues are patched in 0.8.0\n\n### Workarounds\nThere are no workarounds available for these vulnerabilities",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "mpp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.8.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/tempoxyz/mpp-rs/security/advisories/GHSA-fxc9-7j2w-vx54"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/tempoxyz/mpp-rs"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/tempoxyz/mpp-rs/releases/tag/v0.8.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-288", "CWE-294", "CWE-345" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-29T15:20:45Z",
    "nvd_published_at" : null
  }
}