CVE-2025-47951Network attack vector

Second-factor bypass via unrestricted OTP guessing

Published Jun 16, 2025 · Updated Jun 17, 2025

Improper authentication attempt restriction in Weblate before 5.12 allows remote authenticated users to bypass second-factor authentication. SecondFactorMixin dispatch accepted repeated POST attempts without applying the session_ratelimit_post control to second-factor and credential-authentication views. Valid primary credentials and an enabled second factor are required; automated OTP guessing can take over the protected account.

CVSS severity4.9
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication attempt restriction in Weblate before 5.12 allows remote authenticated users to bypass second-factor authentication. SecondFactorMixin dispatch accepted repeated POST attempts without applying the session_ratelimit_post control to second-factor and credential-authentication views. Valid primary credentials and an enabled second factor are required; automated OTP guessing can take over the protected account.

The record

CVE
CVE-2025-47951
Published
Jun 16, 2025
Updated
Jun 17, 2025
Vendor
Weblate
Product
Weblate
Classifications
CWE-307, T1110
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 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=< 5.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Weblate · Weblateversion=< 5.12

Published CVSS scores

4.9GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

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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