CVE-2026-10547: IBM Langflow OSS 1.0.0 through 1.10.3 does not properly validate ownership in the deprecated POST /api/v1/build/{flow_id}/vertices endpoint, allowing an authenticated user to injec

mediumCVSS 5.9CVE-2026-10547

IBM Langflow OSS 1.0.0 through 1.10.3 does not properly validate ownership in the deprecated POST /api/v1/build/{flow_id}/vertices endpoint, allowing an authenticated user to inject arbitrary graph data into a shared cache for any flow. This may result in cross-user cache pollution, unauthorized workflow execution, or denial of service.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.9
Published: 2026-08-05
Last updated: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-10547

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-2026-105470.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-10547	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[NEW] [high] IBM Langflow Desktop: Multiple Vulnerabilitiescert-bund

Recent advisories for IBM Langflow OSS

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-2026-9205: IBM Langflow OSS contains a weak cryptographic key derivation vulnerability in the ensure_ferne…nvd · 2026-08-05
highCVE-2026-9201: IBM Langflow OSS 1.0.0 through 1.10.3 could allow an authenticated attacker to execute arbitrar…nvd · 2026-08-05
highCVE-2026-9196: IBM Langflow OSS 1.0.0 through 1.10.3 could allow an authenticated attacker to execute unintend…nvd · 2026-08-05
highCVE-2026-9130: IBM Langflow OSS 1.0.0 through 1.10.3 contain an authorization bypass vulnerability in the Memo…nvd · 2026-08-05
highCVE-2026-8478: IBM Langflow OSS 1.0.0 through 1.10.3 could allow a remote attacker to inject arbitrary code on…nvd · 2026-08-05
highCVE-2026-8470: IBM Langflow OSS 1.0.0 through 1.10.3, 1.0.0 through 1.10.3, 1.0.0 through 1.10.3, and 1.0.0 th…nvd · 2026-08-05