CVE-2022-50898Public exploitNetwork attack vector

Authenticated code execution via PHP page creation

Published Jan 13, 2026 · Updated Jan 13, 2026

Unrestricted PHP file creation in kalyan02 NanoCMS 0.4 allows remote authenticated users to execute code through page creation. The addpage action in data/nanoadmin.php writes submitted content verbatim to a PHP file under data/pages, where the web server interprets it as code. An authenticated administrative session is required; successful requests create an attacker-controlled PHP page running with the web server process's file-access privileges.

CVSS severity8.6
High
EPSS probability1.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted PHP file creation in kalyan02 NanoCMS 0.4 allows remote authenticated users to execute code through page creation. The addpage action in data/nanoadmin.php writes submitted content verbatim to a PHP file under data/pages, where the web server interprets it as code. An authenticated administrative session is required; successful requests create an attacker-controlled PHP page running with the web server process's file-access privileges.

The record

CVE
CVE-2022-50898
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
kalyan02
Product
NanoCMS
Classifications
CWE-434, CAPEC-1, T1505.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

kalyan02 · NanoCMSversion=0.4

Published CVSS scores

8.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1505.003Server Software Component: Web Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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