Saltcorn up to 1.4.5/1.5.5/1.6.0-beta.4 is_relative_url redirect

Summaryinfo

A vulnerability classified as problematic was found in Saltcorn up to 1.4.5/1.5.5/1.6.0-beta.4. This impacts the function is_relative_url. Executing a manipulation can lead to redirect. This vulnerability is tracked as CVE-2026-42259. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Saltcorn up to 1.4.5/1.5.5/1.6.0-beta.4. It has been declared as problematic. This vulnerability affects the function is_relative_url. The manipulation with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. As an impact it is known to affect integrity. CVE summarizes:

Saltcorn is an extensible, open source, no-code database application builder. Prior to versions 1.4.6, 1.5.6, and 1.6.0-beta.5, Saltcorn validates the post-login dest parameter with a string check that only blocks :/ and //. Because all WHATWG-compliant browsers normalise backslashes (\) to forward slashes (/) for special schemes, a payload such as /\evil.com/path slips through is_relative_url(), is emitted unchanged in the HTTP Location header, and causes the browser to navigate cross-origin to an attacker-controlled domain. The bug is reachable on a default install and only requires a victim who can be tricked into logging in via a crafted Saltcorn URL. This issue has been patched in versions 1.4.6, 1.5.6, and 1.6.0-beta.5.

The advisory is available at github.com. This vulnerability was named CVE-2026-42259 since 04/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1204.001 by the MITRE ATT&CK project.

Upgrading to version 1.4.6, 1.5.6 or 1.6.0-beta.5 eliminates this vulnerability.

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Productinfo

Name

• Saltcorn

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.6.0-beta.0
• 1.6.0-beta.1
• 1.6.0-beta.2
• 1.6.0-beta.3
• 1.6.0-beta.4

Website

• Product: https://github.com/saltcorn/saltcorn/

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