CVE-2019-9842: madskristensen MiniBlog through 2018-05-18 allows remote attackers to execute arbitrary ASPX code via an IMG e

Q: How do I fix CVE-2019-9842?

miniblog: upgrade to newer than 2018-05-18. Exact commands for each OS are on this page.

Q: Is CVE-2019-9842 being exploited?

CVE-2019-9842 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-9842 affect?

CVE-2019-9842 affects miniblog. Severity is high (CVSS 7.2). 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 with

Q: How urgent is CVE-2019-9842?

Priority 51/100. High severity; Public exploit reference

This month

HIGH 7.2UPGRADE

CVE-2019-9842 is a high-severity flaw (CVSS 7.2) affecting miniblog. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-434
Published	2019-06-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: miniblog project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-06-14 20:29 UTCPublished CVE record published
2026-06-17 02:44 UTCUpdated Record last modified

miniblog project miniblog UPGRADE

Affected: <= 2018-05-18

Fixed in: newer than 2018-05-18

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy miniblog || rpm -q miniblog || miniblog --version

2. UPGRADE to newer than 2018-05-18 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade miniblog

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade miniblog

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-9842?

miniblog: upgrade to newer than 2018-05-18. Exact commands for each OS are on this page.

Is CVE-2019-9842 being exploited?

CVE-2019-9842 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-9842 affect?

CVE-2019-9842 affects miniblog. Severity is high (CVSS 7.2). 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 with

How urgent is CVE-2019-9842?

Priority 51/100. High severity; Public exploit reference

References

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