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  4. CVE 2026 8447 langflow is vulnerable to stored cross site
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Back to active CVEs
Medium · CVSS 6.1CVE-2026-8447

Langflow is vulnerable to stored cross-site scripting and IP spoofing due to unsanitized Markdown rendering and untrusted proxy header trustCVE-2026-8447

Answer in brief

CVE-2026-8447 records a Medium severity (CVSS 6.1) vulnerability in Langflow is vulnerable to stored cross-site scripting and IP spoofing due to unsanitized Markdown rendering and untrusted proxy header trust. The current sources do not mark it as known exploited. The current feed maps IBM/Langflow OSS (generic), IBM/Langflow OSS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 4, 2026Updated Sep 8, 2026Source checked Oct 19, 2026First seen by HOL Sep 4, 2026Material review Sep 8, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.1
Exploitation
Not marked as known exploited
Affected software
6 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps IBM/Langflow OSS (generic), IBM/Langflow OSS (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
IBM/Langflow OSSgeneric1.0.0Not reported
IBM/Langflow OSSgeneric>=1.0.0 <=1.11.2Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for IBM/Langflow OSS, IBM/Langflow OSS.
  2. 2Review the reported fix. Source-reported solution: IBM strongly recommends addressing the vulnerability now by upgrading Langflow OSS to version 1.11.3 https://pypi.org/project/langflow/

Evidence timeline and material changes

  1. Published upstream

    Sep 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 4, 2026

Sources and claim methodology

  • Source referenceibm.com
Upstream source description

IBM Langflow OSS 1.0.0 through 1.11.2 suffer from a stored cross-site scripting vulnerability in the Playground chat interface.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • grandnode grandnode2 Product Description Product.Layout.Simple.cshtml Html.Raw cross site scriptingAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 19, 2026
References
1 linked source
Open source record