CVE-2025-62236Network attack vector

Unauthenticated email enumeration via validation responses

Published Oct 23, 2025 · Updated Oct 23, 2025

Information disclosure in the account-validation endpoint on Frontier Airlines flyfrontier.com allows remote attackers to enumerate account emails. The public endpoint returns distinguishable validation results for addresses associated with accounts and addresses that are not. No authentication or user interaction is required, and the disclosed fact is limited to whether an email address belongs to an account.

CVSS severity6.9
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the account-validation endpoint on Frontier Airlines flyfrontier.com allows remote attackers to enumerate account emails. The public endpoint returns distinguishable validation results for addresses associated with accounts and addresses that are not. No authentication or user interaction is required, and the disclosed fact is limited to whether an email address belongs to an account.

The record

CVE
CVE-2025-62236
Published
Oct 23, 2025
Updated
Oct 23, 2025
Vendor
Frontier Airlines
Product
flyfrontier.com
Classifications
CWE-204, CAPEC-541, CAPEC-331, CAPEC-580, CAPEC-332, T1589.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 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=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Frontier Airlines · flyfrontier.comversion=*

Published CVSS scores

6.9CISA U.S. Civilian GovernmentCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
5.3CISA U.S. Civilian GovernmentCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-204Observable Response Discrepancy
CAPEC-541Application Fingerprinting
CAPEC-331ICMP IP Total Length Field Probe
CAPEC-580System Footprinting
CAPEC-332ICMP IP 'ID' Field Error Message Probe
T1589.002Gather Victim Identity Information: Email Addresses

Public exploit references

No public exploit references are available in this record.

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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