PT-2026-23954 · Bytedesk · Bytedesk

Zast.Ai · Published 2026-03-08 · Updated 2026-03-08 · CVE-2026-3748

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Bytedesk versions up to 1.3.9

Description A security flaw exists in Bytedesk that allows for unrestricted file uploads. This issue is present in the SVG File Handler component, specifically within the uploadFile function located in the file source-code/src/main/java/com/bytedesk/core/upload/UploadRestController.java. Exploitation of this flaw is possible remotely, and an exploit has been publicly released.

Recommendations Upgrade to Bytedesk version 1.4.5.1 to address this issue.

Exploit

Fix

Unrestricted File Upload

Improper Access Control

Weakness Enumeration

CWE-434

CWE-284

Related Identifiers

CVE-2026-3748

Affected Products

Bytedesk

References · 15

• 🔥 https://github.com/Bytedesk/bytedesk/issues/18#issue-3993448721 · Exploit
• https://github.com/Bytedesk/bytedesk/releases/tag/v1.4.5.1 · Patch
• https://github.com/Bytedesk/bytedesk/issues/18 · Vendor Advisory
• https://github.com/Bytedesk/bytedesk/issues/18#issuecomment-3976672973 · Vendor Advisory
• https://github.com/Bytedesk/bytedesk/commit/975e39e4dd527596987559f56c5f9f973f64eff7 · Patch
• https://osv.dev/vulnerability/CVE-2026-3748 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3748 · Security Note
• https://github.com/Bytedesk/bytedesk · Note
• https://vuldb.com/?ctiid.349726 · Note
• https://t.me/cveNotify/154700 · Telegram Post
• https://vuldb.com/?submit.768028 · Note
• https://twitter.com/VulmonFeeds/status/2030688089652273453 · Twitter Post
• https://vuldb.com/?id.349726 · Note
• https://t.me/CVEtracker/46819 · Telegram Post
• https://twitter.com/CVEnew/status/2030747849638711647 · Twitter Post