How severe is CVE-2019-9842?

CVE-2019-9842 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-9842 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-9842?

CVE-2019-9842 affects Miniblog Project Miniblog. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-9842?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-9842 published?

CVE-2019-9842 was published on 2019-06-14 and last updated on 2026-06-17.

CVE-2019-9842

CVE-2019-9842 is a high-severity vulnerability in Miniblog Project Miniblog with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-434.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Miniblog Project Miniblog
Published: 2019-06-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-9842?: 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.
How severe is CVE-2019-9842?: CVE-2019-9842 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-9842 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-9842?: CVE-2019-9842 affects Miniblog Project Miniblog. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-9842?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-9842 published?: CVE-2019-9842 was published on 2019-06-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:miniblog_project:miniblog:*:*:*:*:*:*:*:*

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