IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to execute arbitrary flows and access sensitive information due to improper authentication.
CVE-2026-18891
HIGHPre-NVD 8.28.2—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-29. a secondary CVSS source baseline 8.2; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.2
- EG Score
- 8.2(high)
- EG Risk
- 41(Track)EG Risk 41/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity82% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 21%
- KEV
- Not listed
Published
August 28, 2026
Last Modified
August 28, 2026
Advisory Details (1)
Auto-updated Aug 28, 2026No patch confirmed yet.
generic
Security Bulletin: Langflow is affected by multiple authentication bypass, path traversal, authorization, and server-side request forgery vulnerabilities
https://www.ibm.com/support/pages/node/7284579Vendor Advisories for CVE-2026-18891(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-29 23:45 UTCGHSA enrichment
- 2026-08-29 11:15 UTCEG score recompute
- 2026-08-29 11:14 UTCGHSA enrichment
- 2026-08-28 22:41 UTCEG score recompute
- 2026-08-28 22:01 UTCEG score recompute
- 2026-08-28 21:59 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-287
Frequently asked(5)
What is CVE-2026-18891?
CVE-2026-18891 is a high vulnerability published on August 28, 2026. IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to execute arbitrary flows and access sensitive information due to improper authentication.
When was CVE-2026-18891 disclosed?
CVE-2026-18891 was first published in the National Vulnerability Database on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18891 actively exploited?
CVE-2026-18891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 78.7% of all scored CVEs.
What is the CVSS score of CVE-2026-18891?
CVE-2026-18891 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-18891?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18891, 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.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-18891
Is Your Infrastructure Affected by CVE-2026-18891?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.