CVE-2026-44666Public exploitNetwork attack vector

Unauthenticated command execution via incomplete filename sanitization

Published May 14, 2026 · Updated May 14, 2026

OS command injection in HRConvert2 before 3.3.8 allows remote attackers to execute arbitrary commands through crafted conversion requests. The sanitizeString() function in convertCore.php omits backticks and tabs from its strip lists before filenames and extension values reach shell_exec(). Any network user who can access the accountless conversion interface can run commands as the web-server user or write an executable PHP file under the web root.

CVSS severity9.3
Critical
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

OS command injection in HRConvert2 before 3.3.8 allows remote attackers to execute arbitrary commands through crafted conversion requests. The sanitizeString() function in convertCore.php omits backticks and tabs from its strip lists before filenames and extension values reach shell_exec(). Any network user who can access the accountless conversion interface can run commands as the web-server user or write an executable PHP file under the web root.

The record

CVE
CVE-2026-44666
Published
May 14, 2026
Updated
May 14, 2026
Vendor
zelon88
Product
HRConvert2
Classifications
CWE-78, T1190, T1505.003, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2026CVE publishedPublication date reported by the CVE source.
  2. May 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 3.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

zelon88 · HRConvert2version=< 3.3.8

Published CVSS scores

9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application
T1505.003Web Shell
T1059.004Unix Shell

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo