CVE-2026-18899: Langflow is affected by multiple authentication bypass, path traversal, authorization, and server-side request forgery vulnerabilities
Analyzed
Published 28-08-2026Last modified 01-09-2026
Vulnerability summary
CVE-2026-18899 is a high (CVSS 7.5) Path Traversal vulnerability in ibm langflow oss. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 43% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
0.52%
0%100%
Low · +0.05 pp in 30 daysKEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded
Timeline
- 28-08-2026PublishedVulnerability first disclosed.
- 01-09-2026Last modifiedVulnerability information updated.
Description
IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to read arbitrary files due to path traversal.
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NSourcesAll 2 agree
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.52%
Chance of exploitation in the next 30 days
Percentile
43%
Versus all other CVEs
30-day change
Increase +0.05 pp
From 0.46% on 22-09-2026
22-09-202622-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ibm1 product
- langflow oss≥ 1.0.0, ≤ 1.11.1
Langflow1 product
- langflow≥ 1.0.0, < 1.11.2
2 vendors · 2 products