CVE-2026-3346Network attack vector

Stored XSS via unsanitized raw Markdown rendering

Published Apr 30, 2026 · Updated Apr 30, 2026

Stored cross-site scripting in IBM Langflow Desktop 1.6.0 through 1.8.4 allows remote authenticated users to execute JavaScript. The Playground event-streaming and Markdown rendering pipeline passes attacker-controlled content to rehypeRaw without sanitization, preserving injected HTML and script. Any authenticated user who can store content rendered in the Web UI can alter trusted-session behavior and obtain exposed credentials.

CVSS severity6.4
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored cross-site scripting in IBM Langflow Desktop 1.6.0 through 1.8.4 allows remote authenticated users to execute JavaScript. The Playground event-streaming and Markdown rendering pipeline passes attacker-controlled content to rehypeRaw without sanitization, preserving injected HTML and script. Any authenticated user who can store content rendered in the Web UI can alter trusted-session behavior and obtain exposed credentials.

The record

CVE
CVE-2026-3346
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
OpenBMC Project
Product
Langflow Desktop
Classifications
CWE-89, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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=1.6.0 <=1.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenBMC Project · Langflow Desktopversion=1.6.0 <=1.8.4

Published CVSS scores

6.4IBM CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/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-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1059.007JavaScript/JScript

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