CVE-2026-52827Network attack vectorHinoki check available

Two-factor authentication bypass via pre-TOTP session cookie

Published Sep 15, 2026 · Updated Sep 15, 2026

Improper authentication in Kimai before 2.59.0 allows remote authenticated users to access REST API operations without completing TOTP. config/packages/security.yaml accepts IS_AUTHENTICATED on /api, while ApiRequestMatcher routes the pre-TOTP session through the main firewall. A valid account password and enabled TOTP are required; the cookie grants that user's API permissions while browser routes remain blocked.

CVSS severity6.0
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Improper authentication in Kimai before 2.59.0 allows remote authenticated users to access REST API operations without completing TOTP. config/packages/security.yaml accepts IS_AUTHENTICATED on /api, while ApiRequestMatcher routes the pre-TOTP session through the main firewall. A valid account password and enabled TOTP are required; the cookie grants that user's API permissions while browser routes remain blocked.

The record

CVE
CVE-2026-52827
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Kimai
Product
Kimai
Classifications
CWE-287, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=< 2.59.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kimai · Kimaiversion=< 2.59.0

Published CVSS scores

6.0GitHubCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
7.1GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

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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