CVE-2024-58135Public exploitNetwork attack vector

Session-key recovery via weak generated HMAC secrets

Published May 3, 2025 · Updated Jun 5, 2026

Weak HMAC secret generation in Mojolicious 7.28 through 9.45 allows remote attackers to brute-force session keys from signed cookies. The app generator writes a SHA-1 digest of the process ID, monotonic time, and Perl rand() output into generated configuration as the session secret. Exploitation requires a deployed application to retain that generated secret and expose a signed cookie; the bounded consequence is recovery of the session authentication key.

CVSS severity5.3
Medium
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak HMAC secret generation in Mojolicious 7.28 through 9.45 allows remote attackers to brute-force session keys from signed cookies. The app generator writes a SHA-1 digest of the process ID, monotonic time, and Perl rand() output into generated configuration as the session secret. Exploitation requires a deployed application to retain that generated secret and expose a signed cookie; the bounded consequence is recovery of the session authentication key.

The record

CVE
CVE-2024-58135
Published
May 3, 2025
Updated
Jun 5, 2026
Vendor
Mojolicious
Product
Mojolicious
Classifications
CWE-338, T1110.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 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=7.28 <=9.45

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mojolicious · Mojoliciousversion=7.28 <=9.45

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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 exploitPublished

Weakness, pattern, technique

CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
T1110.002Password Cracking

Public exploit references

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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