CVE-2025-64998

highpriority · track · 29EPSS 0.003 · 28 %ileDEEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.35% (28th) EPSS

CVSS 7.2 · high

Is it mine?

10 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.4–7.3

v3.17.2highCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.2 · impact 5.9

v4.07.3highCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:Nsecondary · ENISA EU

v4.07.3highCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · security@checkmk.com

v4.04.4mediumCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-522US

affected products (10)

Products and version ranges known to be affected.

Checkmk Checkmk <2.3.0p45all versionscert_bundDE
Checkmk Checkmk <2.4.0p23all versionscert_bundDE
Checkmk Checkmk< 2.3.0p45cert_bundDE
Checkmk Checkmk< 2.4.0p23cert_bundDE
Checkmk GmbH Checkmk≤ 2.2.0enisa_euvdEU
Checkmk GmbH Checkmk2.3.0 → 2.3.0p45enisa_euvdEU
Checkmk GmbH Checkmk2.4.0 → 2.4.0p23enisa_euvdEU
checkmk checkmk= 2.2.0nvdUScpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*
checkmk checkmk= 2.3.0nvdUScpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*
checkmk checkmk= 2.4.0nvdUScpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-0681Checkmk: Schwachstelle ermöglicht Umgehen von SicherheitsvorkehrungenDeutsch2026-03-10csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Checkmk ausnutzen, um Sicherheitsvorkehrungen zu umgehen und so Sitzungen zu kapern.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2026-03-24modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

https://checkmk.com/Patchcnnvd
https://checkmk.com/werk/18954 cnnvd
https://checkmk.com/werk/18954 enisa_euvd
https://checkmk.com/werk/18954Vendor Advisorynvd

scry

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