What’s Vulnerable › Vulnerabilities

CVE-2019-9842

• Severity: high (CVSS 7.2 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-06-14 · updated 2026-06-17
• Weakness: CWE-434

Description

madskristensen MiniBlog through 2018-05-18 allows remote attackers to execute arbitrary ASPX code via an IMG element with a data: URL, because SaveFilesToDisk in app_code/handlers/PostHandler.cs writes a decoded base64 string to a file without validating the extension.

Affected products

• Miniblog Project Miniblog: through 2018-05-18

References

• https://github.com/madskristensen/MiniBlog/blob/1a7ae45ddba484e2c8f808e288e018748c9ddb57/Website/app_code/handlers/PostHandler.cs#L85
• https://rastating.github.io/miniblog-remote-code-execution/
• https://github.com/madskristensen/MiniBlog/blob/1a7ae45ddba484e2c8f808e288e018748c9ddb57/Website/app_code/handlers/PostHandler.cs#L85
• https://rastating.github.io/miniblog-remote-code-execution/

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