gcdRadar
archive/Patch now/AIR-2026-0495
closedclosed 6 Mar 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-30821: Flowise Arbitrary File Upload via MIME Spoofing

Flowise

Flowise implicitly trusts client-provided Content-Type headers for attachments, enabling arbitrary file uploads. A security update has been published.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
8.2
EPSS
0.17 · top 3% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
6 Mar 2026
last update
7 Mar 2026
CVE ids
CVE-2026-30821other records

Timeline · 2

  1. 6 Mar 2026CVE-2026-30821: Flowise has Arbitrary File Upload via MIME Spoofing
  2. 7 Mar 2026CVE-2026-30821: Flowise is a drag & drop user interface to build a customized large language model flow.

Sources · 2

Advisories and databases

  1. 2026-03-06
    CVE-2026-30821: Flowise has Arbitrary File Upload via MIME Spoofing
    GitHub Advisory Database · github.com/advisories/GHSA-j8g8-j7fc-43v6
  2. 2026-03-07
    CVE-2026-30821: Flowise is a drag & drop user interface to build a customized large language model flow.
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-30821

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
file-uploadflowise
dates
happened 6 Mar 2026 · first reported 6 Mar 2026
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 07:00Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-30821: Flowise Arbitrary File Upload via MIME Spoofing

https://gcdradar.vercel.app/incidents/cve-2026-30821-flowise-arbitrary-file-upload-via-mime-spoofi · AIR-2026-0495 · closed 2026-03-06

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-03-06
- AI role: Attack on AI
- Products: Flowise
- CVE ids: CVE-2026-30821
- CVSS: 8.2

## Summary

Flowise implicitly trusts client-provided Content-Type headers for attachments, enabling arbitrary file uploads. A security update has been published.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-03-07: CVE-2026-30821: Flowise is a drag & drop user interface to build a customized large language model flow. (https://nvd.nist.gov/vuln/detail/CVE-2026-30821)
- 2026-03-06: CVE-2026-30821: Flowise has Arbitrary File Upload via MIME Spoofing (https://github.com/advisories/GHSA-j8g8-j7fc-43v6)

## Sources

- 2026-03-06 GitHub Advisory Database: CVE-2026-30821: Flowise has Arbitrary File Upload via MIME Spoofing https://github.com/advisories/GHSA-j8g8-j7fc-43v6
- 2026-03-07 NVD: CVE-2026-30821: Flowise is a drag & drop user interface to build a customized large language model flow. https://nvd.nist.gov/vuln/detail/CVE-2026-30821

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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    Patch now · Disclosed · since 6 Mar 2026 · updated 7 Mar 2026 · CVE-2026-30822

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  6. closed
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