thinkgem JeeSite 5.15.1 /a/file/upload fileMd5 path traversal

Summaryinfo

A vulnerability identified as critical has been detected in thinkgem JeeSite 5.15.1. This vulnerability affects unknown code of the file /a/file/upload. The manipulation of the argument fileMd5 leads to path traversal. This vulnerability is documented as CVE-2026-36760. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in thinkgem JeeSite 5.15.1. It has been rated as critical. This issue affects some unknown functionality of the file /a/file/upload. The manipulation of the argument fileMd5 with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue in the fileMd5 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 while chunked upload is enabled.

The identification of this vulnerability is CVE-2026-36760 since 04/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/30/2026). MITRE ATT&CK project uses the attack technique T1006 for this issue.

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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CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

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