CVE-2026-6600Public exploitNetwork attack vector

Stored XSS via unsanitized edited chat messages

Published Apr 20, 2026 · Updated Apr 20, 2026

Stored cross-site scripting in Langflow OSS 1.8.0 through 1.8.3 allows remote authenticated users to inject script via edited chat messages. The edit-message.tsx React component renders attacker-controlled chat message content without sufficient neutralization before placing it in the page. Low-privileged access and a victim's interaction with the affected message view are required, and exploitation alters content in the victim's browser session.

CVSS severity3.5
Low
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Langflow OSS 1.8.0 through 1.8.3 allows remote authenticated users to inject script via edited chat messages. The edit-message.tsx React component renders attacker-controlled chat message content without sufficient neutralization before placing it in the page. Low-privileged access and a victim's interaction with the affected message view are required, and exploitation alters content in the victim's browser session.

The record

CVE
CVE-2026-6600
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
OpenBMC Project
Product
Langflow OSS
Classifications
CWE-94, CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 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=1.8.0
  2. Affected versionversion=1.8.1
  3. Affected versionversion=1.8.2
  4. Affected versionversion=1.8.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenBMC Project · Langflow OSSversion=1.8.0; version=1.8.1; version=1.8.2; version=1.8.3

Published CVSS scores

2.0VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

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

Technologies

Your stack

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Your stack

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