How severe is CVE-2026-44666?

CVE-2026-44666 has a CVSS 4.0 base score of 9.3, rated critical severity.

Is CVE-2026-44666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-44666?

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

Does CVE-2026-44666 have an EU (EUVD) identifier?

Yes. CVE-2026-44666 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30480.

When was CVE-2026-44666 published?

CVE-2026-44666 was published on 2026-05-14 and last updated on 2026-06-17.

CVE-2026-44666

CVE-2026-44666 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. 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-78.

Key facts

Severity: Critical (CVSS 4.0 base score 9.3)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30480
Weakness: CWE-78
Published: 2026-05-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-44666?: 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.
How severe is CVE-2026-44666?: CVE-2026-44666 has a CVSS 4.0 base score of 9.3, rated critical severity.
Is CVE-2026-44666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-44666?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-44666 have an EU (EUVD) identifier?: Yes. CVE-2026-44666 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30480.
When was CVE-2026-44666 published?: CVE-2026-44666 was published on 2026-05-14 and last updated on 2026-06-17.

References

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