CVE-2023-3277Network attack vector

Unauthenticated account takeover via unverified Apple login email

Published Nov 3, 2023 · Updated Apr 8, 2026

Authentication bypass in FluxBuilder MStore API 4.10.7 and earlier allows remote attackers to access any user account by email address. The apple_login method accepts a supplied email to select a WordPress user without proving that an Apple identity token belongs to that address. Knowledge of an account's email address is sufficient to obtain its authenticated privileges, including administrator access when that address belongs to an administrator.

CVSS severity9.8
Critical
EPSS probability2.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in FluxBuilder MStore API 4.10.7 and earlier allows remote attackers to access any user account by email address. The apple_login method accepts a supplied email to select a WordPress user without proving that an Apple identity token belongs to that address. Knowledge of an account's email address is sufficient to obtain its authenticated privileges, including administrator access when that address belongs to an administrator.

The record

CVE
CVE-2023-3277
Published
Nov 3, 2023
Updated
Apr 8, 2026
Vendor
FluxBuilder
Product
MStore API
Classifications
CWE-288, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record 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 <=4.10.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FluxBuilder · MStore APIversion=0 <=4.10.7

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
T1078Valid Accounts

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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