CVE-2026-52823Network attack vectorHinoki check available

Unauthorized timesheet changes via state-changing GET routes

Published Sep 15, 2026 · Updated Sep 15, 2026

Cross-site request forgery in Kimai before 2.58.0 allows remote attackers to alter timesheets through a logged-in browser. TimesheetController exposes stop and restart operations as GET routes that reuse the browser session and write timesheet state without request-forgery validation. A victim must remain authenticated and load attacker-controlled content; the resulting writes can stop active entries or create new entries from historical records, corrupting billing, reporting, approvals, and audits.

CVSS severity5.3
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Cross-site request forgery in Kimai before 2.58.0 allows remote attackers to alter timesheets through a logged-in browser. TimesheetController exposes stop and restart operations as GET routes that reuse the browser session and write timesheet state without request-forgery validation. A victim must remain authenticated and load attacker-controlled content; the resulting writes can stop active entries or create new entries from historical records, corrupting billing, reporting, approvals, and audits.

The record

CVE
CVE-2026-52823
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Kimai
Product
Kimai
Classifications
CWE-352, CAPEC-62
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=< 2.58.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kimai · Kimaiversion=< 2.58.0

Published CVSS scores

4.3GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
5.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery

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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