Vulnerability · Published May 14, 2026 · Assigned by GitHub_M

CVE-2026-44666HRConvert2: Missing Sanitization enables Unauthenticated Remote Command Execution

Critical 9.3

In plain English

A critical-severity OS command injection in HRConvert2 from zelon88. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 4.0)9.3Critical

Exploit odds (30 days)0.4%top 68.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

HRConvert2 is a self-hosted, drag-and-drop & nosql file conversion server & share tool. Prior to 3.3.8, the sanitizeString() function in convertCore.php is missing backtick (`) and tab (\t) from its strip list. User input then reaches shell_exec(), where the shell interprets these characters and commands within filenames execute. This vulnerability is fixed in 3.3.8.

Affected products (as reported)

Vendor	Product	Versions
zelon88	HRConvert2	< 3.3.8

Weakness: CWE-78 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

References

https://github.com/zelon88/HRConvert2/security/advisories/GHSA-f74g-4wj8-j35h x_refsource_CONFIRM
https://github.com/zelon88/HRConvert2/releases/tag/v3.3.8 x_refsource_MISC