CVE-2026-80196Public exploitNetwork attack vectorHinoki check available

Account access via reusable password-reset links

Published Aug 25, 2026 · Updated Aug 25, 2026

Authentication bypass in Kimai 2.57.0 and earlier allows remote attackers with a leaked login link to access a user account. The LoginLink signature covers only the internal user ID, so password changes do not invalidate an issued password-reset or admin login link. Exploitation requires interception or caching of a link; after its first use, it grants two more authenticated sessions within the one-hour validity window.

CVSS severityUnavailable
Unscored
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in Kimai 2.57.0 and earlier allows remote attackers with a leaked login link to access a user account. The LoginLink signature covers only the internal user ID, so password changes do not invalidate an issued password-reset or admin login link. Exploitation requires interception or caching of a link; after its first use, it grants two more authenticated sessions within the one-hour validity window.

The record

CVE
CVE-2026-80196
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Kimai
Product
Kimai
Classifications
CWE-640, T1550.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=0 <2.58.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kimai · Kimaiversion=0 <2.58.0

Published CVSS scores

No CVSS assessment is available in this record.

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 exploitPublished

Weakness, pattern, technique

CWE-640Weak Password Recovery Mechanism for Forgotten Password
T1550.001Application Access Token

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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