CVE-2019-9842

Name: CVE-2019-9842
Creator: NVD / NIST
Published: 2019-06-14T20:29:00.353+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.20%

Last modified Jun 17, 2026

CVE-2019-9842 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 2.20% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

2.20%

80.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Miniblog Project	Miniblog	<= 2018-05-18

References

https://github.com/madskristensen/MiniBlog/blob/1a7ae45ddba484e2c8f808e288e018748c9ddb57/Website/app_code/handlers/PostHandler.cs#L85Third Party Advisory
https://rastating.github.io/miniblog-remote-code-execution/Exploit, Third Party Advisory
https://github.com/madskristensen/MiniBlog/blob/1a7ae45ddba484e2c8f808e288e018748c9ddb57/Website/app_code/handlers/PostHandler.cs#L85Third Party Advisory
https://rastating.github.io/miniblog-remote-code-execution/Exploit, Third Party Advisory

Timeline

Published: Jun 14, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-9842?

How severe is CVE-2019-9842?

Severity scoring for CVE-2019-9842 is pending analysis. The EPSS model estimates a 2.20% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9842?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9842?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST