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Security Bulletin: Langflow OSS is affected by stored cross-site scripting in image file handling

Security Bulletin


Summary

Langflow OSS serves user-provided image content as part of its file handling features. Improper handling of SVG image content could allow stored script execution when malicious image files are viewed, which may expose session information or permit actions in the context of another user.

Vulnerability Details

CVEID:   CVE-2026-8506
DESCRIPTION:   Langflow OSS allows attackers can upload malicious SVG files containing JavaScript that executes when viewed, enabling session hijacking by stealing JWT tokens from cookies (access_token_lf, refresh_token_lf), leading to credentials disclosure within a trusted session.
CWE:   CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS Source:   IBM
CVSS Base score:   7.2
CVSS Vector:   (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N)

Affected Products and Versions

Affected Product(s)Version(s)
Langflow OSS1.0.0-1.10.3

Remediation/Fixes

IBM recommends upgrading to Langflow OSS 1.11.0 or newer https://github.com/langflow-ai/langflow/releases

Workarounds and Mitigations

None

Get Notified about Future Security Bulletins

References

Off

Acknowledgement

tenbbughunters

Change History

05 Aug 2026: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location

Worldwide

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Document Information

Modified date:
05 August 2026

Initial Publish date:
05 August 2026

UID

ibm17282649