[NEW] [medium] Checkmk: Multiple vulnerabilities allow bypassing of security measures

mediumCVE-2026-15576 CVE-2026-1593

A remote, anonymous, or authenticated attacker can exploit multiple vulnerabilities in Checkmk to bypass security measures.

CSIRTS triage

vendor: Checkmk product: Checkmk Authentication bypassOther

What: Multiple vulnerabilities in Checkmk allow remote attackers to bypass security measures.
Who is affected: Deployments of Checkmk are affected.
Urgency: Remediation is medium urgency as the vulnerabilities could be exploited by attackers.
Action: Monitor for updates and apply patches when available.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-29
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2567

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-15930.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-15576	coverage & exploitation status	NVD · CVE.org
CVE-2026-1593	coverage & exploitation status	NVD · CVE.org

Recent advisories for Checkmk

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-15227: Missing authorization in Checkmk <2.5.0p10, <2.4.0p35, <2.3.0p49, and 2.2.0 (EOL) allows an au…nvd · 2026-07-31
low[NEW] [low] Checkmk: Vulnerability allows bypassing security measures and manipulating filescert-bund · 2026-07-27
medium[NEW] [medium] Checkmk: Multiple vulnerabilitiescert-bund · 2026-07-22
unknownCVE-2026-8593: Improper permission enforcement in Checkmk versions 2.5.0 before 2.5.0p9, 2.4.0 before 2.4.0p34…nvd · 2026-07-21
unknownCVE-2026-14852: Privilege escalation in Checkmk versions 2.5.0 before 2.5.0p9, 2.4.0 before 2.4.0p34, 2.3.0 be…nvd · 2026-07-14