How severe is CVE-2026-44259?

CVE-2026-44259 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-44259 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-44259?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-44259 have an EU (EUVD) identifier?

Yes. CVE-2026-44259 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29844.

When was CVE-2026-44259 published?

CVE-2026-44259 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-44259

CVE-2026-44259 is a medium-severity vulnerability with a CVSS 3.x base score of 4.6. 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-80.

Key facts

Severity: Medium (CVSS 3.x base score 4.6)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29844
Weakness: CWE-80
Published: 2026-05-12
Last modified: 2026-06-17

Description

efw4.X is an Enterprise Framework for Web. Prior to 4.08.010, the previewServlet serves files with their detected MIME type based on file extension, without any content sanitization or security headers. Files with .html, .htm, or .svg extensions are served as text/html or image/svg+xml respectively, causing any embedded JavaScript to execute in the victim's browser within the application's origin. This vulnerability is fixed in 4.08.010.

Frequently asked questions

What is CVE-2026-44259?: efw4.X is an Enterprise Framework for Web. Prior to 4.08.010, the previewServlet serves files with their detected MIME type based on file extension, without any content sanitization or security headers. Files with .html, .htm, or .svg extensions are served as text/html or image/svg+xml respectively, causing any embedded JavaScript to execute in the victim's browser within the application's origin. This vulnerability is fixed in 4.08.010.
How severe is CVE-2026-44259?: CVE-2026-44259 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-44259 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-44259?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44259 have an EU (EUVD) identifier?: Yes. CVE-2026-44259 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29844.
When was CVE-2026-44259 published?: CVE-2026-44259 was published on 2026-05-12 and last updated on 2026-06-17.

References

https://github.com/efwGrp/efw4.X/security/advisories/GHSA-hw67-p3gw-rrmj

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