sg-summer kkFileView 4.2.0 Cross-Origin File Proxy Endpoint urlPath server-side request forgery

Summaryinfo

A vulnerability labeled as critical has been found in sg-summer kkFileView 4.2.0. The impacted element is an unknown function of the component Cross-Origin File Proxy Endpoint. Such manipulation of the argument urlPath leads to server-side request forgery. This vulnerability is traded as CVE-2026-88592. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in sg-summer kkFileView 4.2.0 and classified as critical. Affected by this issue is an unknown part of the component Cross-Origin File Proxy Endpoint. The manipulation of the argument urlPath with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. CVE summarizes:

kkFileView >= 4.2.0 is vulnerable to Server-Side Request Forgery (SSRF). The cross-origin file proxy endpoint /getCorsFile is protected by TrustHostFilter against the trust.host whitelist. However, the URL parameter validated by the filter is not the same parameter the controller actually fetches: the filter validates the first non-empty parameter in a fixed priority order, while the controller only reads and fetches urlPath. By supplying both urlPath=<real target> and url=<whitelisted decoy address> in the same request, the decoy passes validation while the unvalidated real target is fetched server-side — and the response body is echoed back to the attacker.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-88592 since 09/10/2026. The exploitation is known to be easy. The attack may be launched 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 09/16/2026).

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

• sg-summer

Name

• kkFileView

Version

• 4.2.0

CPE 2.3info

• 🔒

CPE 2.2info

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