File upload vulnerability in Umbraco Forms v.8.7.0 allows unauthenticated attackers to…
Priority MEDIUM 50CWE-434Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-434.
Summary
File upload vulnerability in Umbraco Forms v.8.7.0 allows unauthenticated attackers to execute arbitrary code via a crafted web.config and asp file.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00733 54th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-33224
- 2026-10-03 Alias added: GHSA-74cc-qrjm-qwjc
References
More Umbraco Forms vulnerabilities
- TI-2025-42380 Deserialization of untrusted data in umbraco Forms CVSS 3.1HIGH 7.5
- TI-2020-06205 Insecure Defaults CVSS 3.1HIGH 7.5
- TI-2025-16851 Short and Long Answer Fields Are Not Validated Server-Side For Maximum Length in Umbraco.Forms CVSS 3.1MEDIUM 5.8
- TI-2026-19909 Umbraco.Forms has path traversal and file enumeration vulnerability in Linux/Mac CVSS 4.0MEDIUM 6.0
- TI-2024-23308 Stored Cross-site Scripting on Components of Umbraco Forms CVSS 3.1MEDIUM 5.4
- TI-2025-29810 Umbraco.Forms has HTML injection vulnerability in 'Send email' workflow CVSS 4.0LOW 2.3
Sources
- CVE-2021-33224 · CVE Program
- CVE-2021-33224 · NVD
- FIRST EPSS
- GHSA-74cc-qrjm-qwjc · GitHub Advisory Database · CC BY 4.0
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