mayswind ezBookkeeping up to 1.5.x Router c.ClientIP improper authentication

Summaryinfo

A vulnerability classified as problematic has been found in mayswind ezBookkeeping up to 1.5.x. The affected element is the function c.ClientIP of the component Router. Performing a manipulation results in improper authentication. This vulnerability was named CVE-2026-86041. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in mayswind ezBookkeeping up to 1.5.x. This affects the function c.ClientIP of the component Router. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on integrity. The summary by CVE is:

ezBookkeeping is an open source, self-hosted personal finance application. From 0.10.0 until 1.6.0, ezBookkeeping constructs its Gin router with gin.New() without configuring SetTrustedProxies, causing c.ClientIP() to trust a spoofed X-Forwarded-For value. An unauthenticated remote attacker can supply an allowlisted address to bypass the mcp_allowed_remote_ips or api_token_allowed_remote_ips gate. A valid MCP or API token remains required for protected actions. When such actions occur, the same spoofed value is stored in Transaction.CreatedIp and the request log, attributing activity to the trusted host instead of the attacker. This issue is fixed in version 1.6.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-86041 since 09/04/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.6.0 eliminates this vulnerability.

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Productinfo

Vendor

• mayswind

Name

• ezBookkeeping

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5

Website

• Product: https://github.com/mayswind/ezbookkeeping/

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