CVE-2024-43201Public exploit

Session-token theft via improper TLS certificate validation

Published Sep 23, 2024 · Updated Feb 28, 2025

Improper certificate validation in Planet Fitness App before 9.9.13 allows man-in-the-middle attackers to obtain session tokens and sensitive data. The iOS and Android clients accept attacker-presented self-signed certificates for Planet Fitness and Auth0 connections instead of rejecting them. An attacker controlling the victim's network path can reuse the exposed bearer token for account access and read personal, health, visit, and partial financial data.

CVSS severity8.7
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Planet Fitness App before 9.9.13 allows man-in-the-middle attackers to obtain session tokens and sensitive data. The iOS and Android clients accept attacker-presented self-signed certificates for Planet Fitness and Auth0 connections instead of rejecting them. An attacker controlling the victim's network path can reuse the exposed bearer token for account access and read personal, health, visit, and partial financial data.

The record

CVE
CVE-2024-43201
Published
Sep 23, 2024
Updated
Feb 28, 2025
Vendor
Planet Fitness
Product
Planet Fitness App
Classifications
CWE-295, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <9.8.12
  2. Affected versionversion=0 <9.9.13

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Planet Fitness · Planet Fitness Appversion=0 <9.8.12; version=0 <9.9.13

Published CVSS scores

8.7Cybersecurity and Infrastructure Security AgencyCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:X/R:U/V:D/RE:L/U:Amber
8.8Cybersecurity and Infrastructure Security AgencyCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.9National Institute of Standards and TechnologyCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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