CVE-2025-2596: Session logout can be overwritten by long lasting request

Published Mar 26, 2025
·
Updated

Session logout could be overwritten in Checkmk GmbH's Checkmk versions <2.3.0p30, <2.2.0p41, and 2.1.0p49 (EOL)

Affected Software

147 affected components
Checkmk GmbH Checkmk<2.3.0p30, <2.2.0p41
Checkmk Checkmk<2.1.0
Checkmk Checkmk=2.1.0
Checkmk Checkmk=2.1.0-b1
Checkmk Checkmk=2.1.0-b2
Checkmk Checkmk=2.1.0-b3
Checkmk Checkmk=2.1.0-b4
Checkmk Checkmk=2.1.0-b5
Checkmk Checkmk=2.1.0-b6
Checkmk Checkmk=2.1.0-b7
Checkmk Checkmk=2.1.0-b8
Checkmk Checkmk=2.1.0-b9
Checkmk Checkmk=2.1.0-p1
Checkmk Checkmk=2.1.0-p10
Checkmk Checkmk=2.1.0-p11
Checkmk Checkmk=2.1.0-p12
Checkmk Checkmk=2.1.0-p13
Checkmk Checkmk=2.1.0-p14
Checkmk Checkmk=2.1.0-p15
Checkmk Checkmk=2.1.0-p16
Checkmk Checkmk=2.1.0-p17
Checkmk Checkmk=2.1.0-p18
Checkmk Checkmk=2.1.0-p19
Checkmk Checkmk=2.1.0-p2
Checkmk Checkmk=2.1.0-p20
Checkmk Checkmk=2.1.0-p21
Checkmk Checkmk=2.1.0-p22
Checkmk Checkmk=2.1.0-p23
Checkmk Checkmk=2.1.0-p24
Checkmk Checkmk=2.1.0-p25
Checkmk Checkmk=2.1.0-p26
Checkmk Checkmk=2.1.0-p27
Checkmk Checkmk=2.1.0-p28
Checkmk Checkmk=2.1.0-p29
Checkmk Checkmk=2.1.0-p3
Checkmk Checkmk=2.1.0-p30
Checkmk Checkmk=2.1.0-p31
Checkmk Checkmk=2.1.0-p32
Checkmk Checkmk=2.1.0-p33
Checkmk Checkmk=2.1.0-p34
Checkmk Checkmk=2.1.0-p35
Checkmk Checkmk=2.1.0-p36
Checkmk Checkmk=2.1.0-p37
Checkmk Checkmk=2.1.0-p38
Checkmk Checkmk=2.1.0-p39
Checkmk Checkmk=2.1.0-p4
Checkmk Checkmk=2.1.0-p40
Checkmk Checkmk=2.1.0-p41
Checkmk Checkmk=2.1.0-p42
Checkmk Checkmk=2.1.0-p43
Checkmk Checkmk=2.1.0-p44
Checkmk Checkmk=2.1.0-p45
Checkmk Checkmk=2.1.0-p46
Checkmk Checkmk=2.1.0-p47
Checkmk Checkmk=2.1.0-p48
Checkmk Checkmk=2.1.0-p5
Checkmk Checkmk=2.1.0-p6
Checkmk Checkmk=2.1.0-p7
Checkmk Checkmk=2.1.0-p8
Checkmk Checkmk=2.1.0-p9
Checkmk Checkmk=2.2.0
Checkmk Checkmk=2.2.0-b1
Checkmk Checkmk=2.2.0-b2
Checkmk Checkmk=2.2.0-b3
Checkmk Checkmk=2.2.0-b4
Checkmk Checkmk=2.2.0-b5
Checkmk Checkmk=2.2.0-b6
Checkmk Checkmk=2.2.0-b7
Checkmk Checkmk=2.2.0-b8
Checkmk Checkmk=2.2.0-i1
Checkmk Checkmk=2.2.0-p1
Checkmk Checkmk=2.2.0-p10
Checkmk Checkmk=2.2.0-p11
Checkmk Checkmk=2.2.0-p12
Checkmk Checkmk=2.2.0-p13
Checkmk Checkmk=2.2.0-p14
Checkmk Checkmk=2.2.0-p15
Checkmk Checkmk=2.2.0-p16
Checkmk Checkmk=2.2.0-p17
Checkmk Checkmk=2.2.0-p18
Checkmk Checkmk=2.2.0-p19
Checkmk Checkmk=2.2.0-p2
Checkmk Checkmk=2.2.0-p20
Checkmk Checkmk=2.2.0-p21
Checkmk Checkmk=2.2.0-p22
Checkmk Checkmk=2.2.0-p23
Checkmk Checkmk=2.2.0-p24
Checkmk Checkmk=2.2.0-p25
Checkmk Checkmk=2.2.0-p26
Checkmk Checkmk=2.2.0-p27
Checkmk Checkmk=2.2.0-p28
Checkmk Checkmk=2.2.0-p29
Checkmk Checkmk=2.2.0-p3
Checkmk Checkmk=2.2.0-p30
Checkmk Checkmk=2.2.0-p31
Checkmk Checkmk=2.2.0-p32
Checkmk Checkmk=2.2.0-p33
Checkmk Checkmk=2.2.0-p34
Checkmk Checkmk=2.2.0-p35
Checkmk Checkmk=2.2.0-p36
Checkmk Checkmk=2.2.0-p37
Checkmk Checkmk=2.2.0-p38
Checkmk Checkmk=2.2.0-p39
Checkmk Checkmk=2.2.0-p4
Checkmk Checkmk=2.2.0-p40
Checkmk Checkmk=2.2.0-p5
Checkmk Checkmk=2.2.0-p6
Checkmk Checkmk=2.2.0-p7
Checkmk Checkmk=2.2.0-p8
Checkmk Checkmk=2.2.0-p9
Checkmk Checkmk=2.3.0
Checkmk Checkmk=2.3.0
Checkmk Checkmk=2.3.0-b1
Checkmk Checkmk=2.3.0-b2
Checkmk Checkmk=2.3.0-b3
Checkmk Checkmk=2.3.0-b4
Checkmk Checkmk=2.3.0-b5
Checkmk Checkmk=2.3.0-b6
Checkmk Checkmk=2.3.0-p1
Checkmk Checkmk=2.3.0-p10
Checkmk Checkmk=2.3.0-p11
Checkmk Checkmk=2.3.0-p12
Checkmk Checkmk=2.3.0-p13
Checkmk Checkmk=2.3.0-p14
Checkmk Checkmk=2.3.0-p15
Checkmk Checkmk=2.3.0-p16
Checkmk Checkmk=2.3.0-p17
Checkmk Checkmk=2.3.0-p18
Checkmk Checkmk=2.3.0-p19
Checkmk Checkmk=2.3.0-p2
Checkmk Checkmk=2.3.0-p20
Checkmk Checkmk=2.3.0-p21
Checkmk Checkmk=2.3.0-p22
Checkmk Checkmk=2.3.0-p23
Checkmk Checkmk=2.3.0-p24
Checkmk Checkmk=2.3.0-p25
Checkmk Checkmk=2.3.0-p26
Checkmk Checkmk=2.3.0-p27
Checkmk Checkmk=2.3.0-p28
Checkmk Checkmk=2.3.0-p29
Checkmk Checkmk=2.3.0-p3
Checkmk Checkmk=2.3.0-p4
Checkmk Checkmk=2.3.0-p5
Checkmk Checkmk=2.3.0-p6
Checkmk Checkmk=2.3.0-p7
Checkmk Checkmk=2.3.0-p8
Checkmk Checkmk=2.3.0-p9

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade checkmk to a version that resolves this vulnerability.

    Fixed in 2.3.0p30
  2. Upgrade

    Upgrade checkmk to a version that resolves this vulnerability.

    Fixed in 2.2.0p41
  3. Upgrade

    Upgrade checkmk to a version that resolves this vulnerability.

    Fixed in 2.1.0p49

Event History

Mar 26, 2025
CVE Published
via MITRE·10:51 AM
Data Sourced
via MITRE·10:51 AM
DescriptionWeakness
Data Sourced
via NVD·11:15 AM
DescriptionSeverityWeaknessAffected Software
May 21, 58462
Event
via NVD·07:28 PM

Frequently Asked Questions

1

What is the severity of CVE-2025-2596?

CVE-2025-2596 has a medium severity level as it allows session logout to be overwritten.

2

How do I fix CVE-2025-2596?

To fix CVE-2025-2596, upgrade to Checkmk versions 2.3.0p30 or later, 2.2.0p41 or later, or 2.1.0p49 or later.

3

Which versions of Checkmk are affected by CVE-2025-2596?

CVE-2025-2596 affects Checkmk versions prior to 2.3.0p30, 2.2.0p41, and 2.1.0p49.

4

What kind of attacks can exploit CVE-2025-2596?

Attackers can exploit CVE-2025-2596 to maintain a session after a user intends to log out, potentially leading to unauthorized access.

5

Is there a workaround for CVE-2025-2596?

Currently, the recommended action for CVE-2025-2596 is to update to the secure versions, as no official workaround is provided.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203