thinkgem JeeSite 5.15.1 File Upload /a/file/upload fileEntityId path traversal

Summaryinfo

A vulnerability labeled as critical has been found in thinkgem JeeSite 5.15.1. This issue affects some unknown processing of the file /a/file/upload of the component File Upload Handler. The manipulation of the argument fileEntityId results in path traversal. This vulnerability is reported as CVE-2026-36762. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical has been found in thinkgem JeeSite 5.15.1. Affected is an unknown part of the file /a/file/upload of the component File Upload Handler. The manipulation of the argument fileEntityId with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

An issue in the fileEntityId parameter in the /a/file/upload endpoint of JeeSite v5.15.1 allows authenticated attackers with file upload permissions to execute a path traversal and write arbitrary files with whitelisted suffixes to arbitrary filesystem locations.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-36762 since 04/06/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/30/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• thinkgem

Name

• JeeSite

Version

• 5.15.1

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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CVSSv2info

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Threat Intelligenceinfo

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Entryinfo

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