Is CVE-2026-16451 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-16451 being exploited in the wild.

How severe is CVE-2026-16451?

Medium severity, with a CVSS score of 6.3, published 21 July 2026.

Which products and versions are affected?

Zsadmin2025 ZS-Admin up to b52e14536d59fda11e56e2536a1c32e82a38cead.

Is there a fix for CVE-2026-16451?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-16451 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-16451?

Check whether you run Zsadmin2025 ZS-Admin at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-16451: zsadmin2025 ZS-Admin unrestricted file upload in SysFileController

CVE-2026-16451 · Severity: medium · CVSS 6.3 · Published 2026-07-21

ZS-Admin, a Java-based administrative framework, contains a security flaw in its file management system. An authenticated user can upload files with dangerous extensions, such as .html or .svg, because the system fails to verify file types. This could allow an attacker to host malicious scripts on the server, potentially leading to the theft of user sessions or unauthorized actions through cross-site scripting (XSS).

Technologies: Zsadmin2025 ZS-Admin. Vendors: Zsadmin2025.

Quick answers

Is CVE-2026-16451 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-16451 being exploited in the wild.
How severe is CVE-2026-16451?: Medium severity, with a CVSS score of 6.3, published 21 July 2026.
Which products and versions are affected?: Zsadmin2025 ZS-Admin up to b52e14536d59fda11e56e2536a1c32e82a38cead.
Is there a fix for CVE-2026-16451?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-16451 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-16451?: Check whether you run Zsadmin2025 ZS-Admin at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An unrestricted file upload vulnerability exists in ZS-Admin's `SysFileController` at the `/api/system/file/upload` endpoint. The application uses `MultipartFile.getOriginalFilename()` to extract extensions without implementing a whitelist for file types, MIME types, or magic-byte validation. An authenticated attacker can upload malicious files (e.g., .svg, .html, or .jsp) which are then stored using a UUID-based naming convention. While JSP execution was not confirmed, the ability to upload and access these files enables stored cross-site scripting (XSS) if the server renders the content inline. As of the advisory date, no patch has been released by the vendor.

Affected products

zsadmin2025 ZS-Admin up to b52e14536d59fda11e56e2536a1c32e82a38cead

Timeline

2026-06-15: disclosed: Issue reported to the project via GitHub
2026-07-21: advisory: NVD/VulDB advisory published

References

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