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CVE-2025-64998 Details
Description
Exposure of session signing secret in Checkmk <2.4.0p23, <2.3.0p45 and 2.2.0 allows an administrator of a remote site with config sync enabled to hijack sessions on the central site by forging session cookies.
A vulnerability in Checkmk versions 2.4.0 prior to 2.4.0p23, 2.3.0 prior to 2.3.0p45, and 2.2.0 allows an administrator of a remote site with configuration synchronization enabled to hijack sessions on the central site by forging session cookies. This issue arises because the session signing secret was inadvertently shared with remote sites through the configuration sync, enabling the creation of valid cookies for existing session IDs.
Users can update to Checkmk versions 2.4.0p23 or 2.3.0p45. Instructions for downloading the latest version are available on the Checkmk website.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 24, 2026Exploitation: NoneAutomatable: NoTechnical Impact: Total
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://checkmk.com/werk/18954 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-522 | Insufficiently Protected Credentials | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| checkmk checkmk | 2.2.0 - 2.2.0 b1 2.2.0 b2 2.2.0 b3 2.2.0 b4 2.2.0 b5 2.2.0 b6 2.2.0 b7 2.2.0 b8 2.2.0 i1 2.2.0 p1 2.2.0 p10 2.2.0 p11 2.2.0 p12 2.2.0 p13 2.2.0 p14 2.2.0 p15 2.2.0 p16 2.2.0 p17 2.2.0 p18 2.2.0 p19 2.2.0 p2 2.2.0 p20 2.2.0 p21 2.2.0 p22 2.2.0 p23 2.2.0 p24 2.2.0 p25 2.2.0 p26 2.2.0 p27 2.2.0 p28 2.2.0 p29 2.2.0 p3 2.2.0 p30 2.2.0 p31 2.2.0 p32 2.2.0 p33 2.2.0 p34 2.2.0 p35 2.2.0 p36 2.2.0 p37 2.2.0 p38 2.2.0 p39 2.2.0 p4 2.2.0 p40 2.2.0 p41 2.2.0 p42 2.2.0 p43 2.2.0 p44 2.2.0 p45 2.2.0 p46 2.2.0 p47 2.2.0 p5 2.2.0 p6 2.2.0 p7 2.2.0 p8 2.2.0 p9 2.3.0 - 2.3.0 b1 2.3.0 b2 2.3.0 b3 2.3.0 b4 2.3.0 b5 2.3.0 b6 2.3.0 p1 2.3.0 p10 2.3.0 p11 2.3.0 p12 2.3.0 p13 2.3.0 p14 2.3.0 p15 2.3.0 p16 2.3.0 p17 2.3.0 p18 2.3.0 p19 2.3.0 p2 2.3.0 p20 2.3.0 p21 2.3.0 p22 2.3.0 p23 2.3.0 p24 2.3.0 p25 2.3.0 p26 2.3.0 p27 2.3.0 p28 2.3.0 p29 2.3.0 p3 2.3.0 p30 2.3.0 p31 2.3.0 p32 2.3.0 p33 2.3.0 p34 2.3.0 p35 2.3.0 p36 2.3.0 p37 2.3.0 p38 2.3.0 p39 2.3.0 p4 2.3.0 p40 2.3.0 p41 2.3.0 p42 2.3.0 p43 2.3.0 p44 2.3.0 p5 2.3.0 p6 2.3.0 p7 2.3.0 p8 2.3.0 p9 2.4.0 - 2.4.0 b1 2.4.0 b2 2.4.0 b3 2.4.0 b4 2.4.0 b5 2.4.0 b6 2.4.0 p1 2.4.0 p10 2.4.0 p11 2.4.0 p12 2.4.0 p13 2.4.0 p14 2.4.0 p15 2.4.0 p16 2.4.0 p17 2.4.0 p18 2.4.0 p19 2.4.0 p2 2.4.0 p20 2.4.0 p21 2.4.0 p22 2.4.0 p3 2.4.0 p4 2.4.0 p5 2.4.0 p6 2.4.0 p7 2.4.0 p8 2.4.0 p9 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 12, 2026 | Initial Analysis | [email protected] |
| Mar 24, 2026 | New CVE Received | [email protected] |