CVE-2024-52871Network attack vector

Unauthorized account registration via missing invitation validation

Published Nov 17, 2024 · Updated Nov 18, 2024

Authentication bypass in Flagsmith before 2.134.1 allows remote attackers to register accounts when invitation-only signup is enabled. The registration API accepted signup requests without validating an invitation, leaving the restriction enforced only by the user interface. The flaw is reachable without authentication only when ALLOW_REGISTRATION_WITHOUT_INVITE is disabled, and successful exploitation creates an unauthorized account.

CVSS severity7.5
High
EPSS probability0.42%
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 Flagsmith before 2.134.1 allows remote attackers to register accounts when invitation-only signup is enabled. The registration API accepted signup requests without validating an invitation, leaving the restriction enforced only by the user interface. The flaw is reachable without authentication only when ALLOW_REGISTRATION_WITHOUT_INVITE is disabled, and successful exploitation creates an unauthorized account.

The record

CVE
CVE-2024-52871
Published
Nov 17, 2024
Updated
Nov 18, 2024
Vendor
Flagsmith
Product
Flagsmith
Classifications
T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 2024Record 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 <2.134.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Flagsmith · Flagsmithversion=0 <2.134.1

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1136Create Account

Public exploit references

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Technologies

Your stack

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Your stack

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