Authenticated TFA bypass via unrestricted code guessing
Published Mar 31, 2025 · Updated Jun 19, 2025
Weak authentication in Drupal Email TFA 2.0.0 through 2.0.2 allows remote authenticated users to bypass email TFA by brute force. The verification-code handler accepts repeated guesses without sufficient brute-force protection, but Drupal has not disclosed the responsible function or counter logic. A valid username and password are required; successful guessing completes login as the compromised account.
Summary
What happened
Weak authentication in Drupal Email TFA 2.0.0 through 2.0.2 allows remote authenticated users to bypass email TFA by brute force. The verification-code handler accepts repeated guesses without sufficient brute-force protection, but Drupal has not disclosed the responsible function or counter logic. A valid username and password are required; successful guessing completes login as the compromised account.
The record
- CVE
- CVE-2025-31676
- Published
- Mar 31, 2025
- Updated
- Jun 19, 2025
- Vendor
- OAuth.js
- Product
- Email TFA
- Classifications
- CWE-1390, CWE-307, CAPEC-112, T1110
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 31, 2025CVE publishedPublication date reported by the CVE source.
- Jun 19, 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.
- Affected versionversion=2.0.0 <2.0.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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