CVE-2026-18545Network attack vectorHinoki check available

Internal network probing via undisclosed SSRF mechanism

Published Aug 28, 2026 · Updated Aug 28, 2026

SSRF in IBM Langflow OSS 1.0.0 through 1.11.1 allows remote authenticated users to issue unauthorized server-side requests. IBM's individual CVE record does not identify the affected flow component or the exact URL-validation failure that accepts an attacker-controlled destination. Low-privileged authenticated access is required; resulting requests can probe hosts reachable from the Langflow server and expose limited internal-service data.

CVSS severity4.3
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

SSRF in IBM Langflow OSS 1.0.0 through 1.11.1 allows remote authenticated users to issue unauthorized server-side requests. IBM's individual CVE record does not identify the affected flow component or the exact URL-validation failure that accepts an attacker-controlled destination. Low-privileged authenticated access is required; resulting requests can probe hosts reachable from the Langflow server and expose limited internal-service data.

The record

CVE
CVE-2026-18545
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
IBM
Product
Langflow OSS
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <=1.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · Langflow OSSversion=1.0.0 <=1.11.1

Published CVSS scores

4.3IBMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo