CVE-2026-46473Network attack vector

TOTP secret prediction via noncryptographic random generation

Published May 21, 2026 · Updated May 21, 2026

Insufficient entropy in Authen::TOTP before 0.1.1 allows remote attackers to predict TOTP secrets generated by the module. The Authen::TOTP::gen_secret routine uses Perl's noncryptographic rand function to choose the secret length and each character from a fixed alphabet. Applications are exposed when they rely on a module-generated secret rather than supplying one, and prediction compromises the confidentiality of the TOTP factor.

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

Insufficient entropy in Authen::TOTP before 0.1.1 allows remote attackers to predict TOTP secrets generated by the module. The Authen::TOTP::gen_secret routine uses Perl's noncryptographic rand function to choose the secret length and each character from a fixed alphabet. Applications are exposed when they rely on a module-generated secret rather than supplying one, and prediction compromises the confidentiality of the TOTP factor.

The record

CVE
CVE-2026-46473
Published
May 21, 2026
Updated
May 21, 2026
Vendor
Thanos Chatziathanassiou
Product
Authen::TOTP
Classifications
CWE-331
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2026CVE publishedPublication date reported by the CVE source.
  2. May 21, 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?

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  1. Affected versionversion=0 <0.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Thanos Chatziathanassiou · Authen::TOTPversion=0 <0.1.1

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

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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

CWE-331Insufficient Entropy

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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