CVE-2022-50898: NanoCMS 0.4 contains an authenticated file upload vulnerability that allows remote code execution through unva

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HIGH 8.8DOWNGRADE

CVE-2022-50898 is a high-severity flaw (CVSS 8.8) affecting nanocms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NanoCMS 0.4 contains an authenticated file upload vulnerability that allows remote code execution through unvalidated page content creation. Authenticated attackers can upload PHP files with arbitrary code to the server's pages directory by exploiting the page creation mechanism without proper input sanitization.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-434
Published	2026-01-13
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: kalyan02

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

Am I affected?

Timeline

2026-01-13 23:15 UTCPublished CVE record published
2026-06-17 05:24 UTCUpdated Record last modified

kalyan02 nanocms DOWNGRADE

Affected: 0.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.4 (Debian / Ubuntu)

apt-cache madison nanocms sudo apt install nanocms=<VERSION_BEFORE_0.4> sudo apt-mark hold nanocms

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nanocms sudo dnf downgrade nanocms-<VERSION_BEFORE_0.4> sudo dnf versionlock add nanocms

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2022-50898?

nanocms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-50898 being exploited?

CVE-2022-50898 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-2022-50898 affect?

CVE-2022-50898 affects nanocms. Severity is high (CVSS 8.8). NanoCMS 0.4 contains an authenticated file upload vulnerability that allows remote code execution through unvalidated page content creation. Authenticated attackers can upload PHP files with arbitrary code to the server's pages directory by

How urgent is CVE-2022-50898?

Priority 53/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-1978 MEDIUM 5.3 UPGRADE A vulnerability was detected in kalyan02 NanoCMS up to 0.4

References

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