[UPDATE] [medium] Prometheus: Multiple vulnerabilities

mediumCVE-2026-44903 CVE-2026-42151 CVE-2026-42154

An attacker can exploit multiple vulnerabilities in Prometheus to conduct a denial of service attack, disclose confidential information, or perform cross-site scripting attacks.

CSIRTS triage

vendor: Prometheus product: Prometheus Denial of service Information disclosure Cross-site scripting

What: Multiple vulnerabilities allow an attacker to conduct a denial of service attack, disclose confidential information, or perform cross-site scripting attacks.
Who is affected: Deployments of Prometheus are affected.
Urgency: Remediation is medium urgency due to the variety of potential impacts including denial of service and information disclosure.
Action: Update to the latest version of Prometheus.

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: 2026-09-04
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-2026-1292

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-2026-449030.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-421510.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-421540.81% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 54% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-44903	coverage & exploitation status	NVD · CVE.org
CVE-2026-42151	coverage & exploitation status	NVD · CVE.org
CVE-2026-42154	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highGHSA-wg65-39gg-5wfj: Prometheus Azure AD remote write OAuth client secret exposed via config APIghsa

Recent advisories for Prometheus

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.

highCVE-2026-76262: In Splunk Enterprise 10.4 versions below 10.4.2, an unauthenticated user could read Prometheus…nvd · 2026-08-19
mediumCVE-2026-67990: basecamp/upright at commit efe4f2e5254ac6e57e45d2261804cca74dbbca3f disables Rails CSRF protec…nvd · 2026-08-13
mediumCVE-2026-16100: A flaw was found in the user-event metrics recording of Keycloak. When metrics are enabled, th…nvd · 2026-08-05
criticalCVE-2026-67342: ArcadeDB versions before 26.7.2 contain an authorization bypass vulnerability in HTTP handlers…nvd · 2026-08-01
highGHSA-x8mg-6r4p-87pf: ArcadeDB has cross-database IDOR: /ts/*, /batch/*, Prometheus and Grafana handlers bypass…ghsa · 2026-07-16
highGHSA-wg65-39gg-5wfj: Prometheus Azure AD remote write OAuth client secret exposed via config APIghsa · 2026-05-05