CVE-2024-4596Network attack vector

Session data disclosure via unthrottled identifier prediction

Published May 7, 2024 · Updated Aug 1, 2024

Information disclosure in Kimai 2.0 through 2.15 allows remote attackers to access session data through predicted session identifiers. The Session Handler accepts repeated attacker-supplied PHPSESSID values without rate limiting, enabling high-volume session-prediction attempts. No account or user interaction is required, but exploitation has high complexity and is limited to confidential session information.

CVSS severity3.7
Low
EPSS probability0.79%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Kimai 2.0 through 2.15 allows remote attackers to access session data through predicted session identifiers. The Session Handler accepts repeated attacker-supplied PHPSESSID values without rate limiting, enabling high-volume session-prediction attempts. No account or user interaction is required, but exploitation has high complexity and is limited to confidential session information.

The record

CVE
CVE-2024-4596
Published
May 7, 2024
Updated
Aug 1, 2024
Vendor
Kimai
Product
Kimai
Classifications
CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0
  2. Affected versionversion=2.1
  3. Affected versionversion=2.10
  4. Affected versionversion=2.11
  5. Affected versionversion=2.12
  6. Affected versionversion=2.13
  7. Affected versionversion=2.14
  8. Affected versionversion=2.15
  9. Affected versionversion=2.2
  10. Affected versionversion=2.3
  11. Affected versionversion=2.4
  12. Affected versionversion=2.5
  13. Affected versionversion=2.6
  14. Affected versionversion=2.7
  15. Affected versionversion=2.8
  16. Affected versionversion=2.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kimai · Kimaiversion=2.0; version=2.1; version=2.10; version=2.11; version=2.12; version=2.13; version=2.14; version=2.15; version=2.2; version=2.3; version=2.4; version=2.5; version=2.6; version=2.7; version=2.8; version=2.9

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
2.6VulDBAV:N/AC:H/Au:N/C:P/I:N/A:N
3.7VulDBCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
3.7VulDBCVSS:3.1/AV:N/AC:H/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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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