[NEW] [medium] OpenCTI: Vulnerability allows Denial of Service

mediumCVE-2026-35211

A remote, authenticated attacker can exploit a vulnerability in OpenCTI to perform a Denial of Service attack.

CSIRTS triage

vendor: OpenCTI product: OpenCTI Denial of service

What: A vulnerability allows a remote, authenticated attacker to perform a Denial of Service attack.
Who is affected: Authenticated users of OpenCTI are affected.
Urgency: Remediation is medium due to the potential for exploitation, but not currently known to be actively exploited.
Action: Update to the latest version of OpenCTI.

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: 2026-07-09
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-2026-2255

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-2026-352110.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-35211	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

mediumCVE-2026-35211: OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observ…nvd

Recent advisories for OpenCTI

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.

medium[UPDATE] [medium] OpenCTI: Vulnerability allows bypassing security measurescert-bund · 2026-07-09
mediumCVE-2026-35211: OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observ…nvd · 2026-07-08
highCVE-2026-35210: OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observ…nvd · 2026-07-08