How severe is CVE-2026-3749?

CVE-2026-3749 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-3749 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3749?

CVE-2026-3749 affects Bytedesk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3749?

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

Does CVE-2026-3749 have an EU (EUVD) identifier?

Yes. CVE-2026-3749 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10252.

When was CVE-2026-3749 published?

CVE-2026-3749 was published on 2026-03-08 and last updated on 2026-06-17.

CVE-2026-3749

CVE-2026-3749 is a medium-severity vulnerability in Bytedesk with a CVSS 3.x base score of 6.3. 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-434.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 6.5
CVSS v4: 2.1
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10252
Weakness: CWE-434
Affected product: Bytedesk
Published: 2026-03-08
Last modified: 2026-06-17

Description

A weakness has been identified in Bytedesk up to 1.3.9. This vulnerability affects the function handleFileUpload of the file source-code/src/main/java/com/bytedesk/core/upload/UploadRestService.java of the component SVG File Handler. Executing a manipulation can lead to unrestricted upload. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 1.4.5.1 is able to resolve this issue. This patch is called 975e39e4dd527596987559f56c5f9f973f64eff7. It is recommended to upgrade the affected component.

Frequently asked questions

What is CVE-2026-3749?: A weakness has been identified in Bytedesk up to 1.3.9. This vulnerability affects the function handleFileUpload of the file source-code/src/main/java/com/bytedesk/core/upload/UploadRestService.java of the component SVG File Handler. Executing a manipulation can lead to unrestricted upload. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 1.4.5.1 is able to resolve this issue. This patch is called 975e39e4dd527596987559f56c5f9f973f64eff7. It is recommended to upgrade the affected component.
How severe is CVE-2026-3749?: CVE-2026-3749 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-3749 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3749?: CVE-2026-3749 affects Bytedesk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3749?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3749 have an EU (EUVD) identifier?: Yes. CVE-2026-3749 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10252.
When was CVE-2026-3749 published?: CVE-2026-3749 was published on 2026-03-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bytedesk:bytedesk:*:*:*:*:*:*:*:*

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