CVE-2025-64998

HIGHNVD 7.27.2—

7.2

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 v3: 7.2
EG Score: 7.2(medium)
EPSS: 6.0%
KEV: Not listed

Published

March 24, 2026

Last Modified

May 12, 2026

References (1)

security@checkmkhttps://checkmk.com/werk/18954

Data Freshness Timeline

(refreshed 18× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
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2026-05-31 00:16 UTCepss_batch
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2026-05-29 13:44 UTCepss_batch
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2026-05-23 15:21 UTCepss_batch
2026-05-22 21:16 UTCepss_batch

Frequently asked(5)

What is CVE-2025-64998?

CVE-2025-64998 is a high vulnerability published on March 24, 2026. 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.

When was CVE-2025-64998 disclosed?

CVE-2025-64998 was first published in the National Vulnerability Database on March 24, 2026, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-64998 actively exploited?

CVE-2025-64998 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-64998?

CVE-2025-64998 has a CVSS v3 base score of 7.2 (NVD).

How do I remediate CVE-2025-64998?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-64998, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2025-64998

📅 Published

🔄 Last Modified

🔗 References (1)