CVE-2026-42259: Saltcorn

Medium severity, CVSS 5.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Saltcorn Saltcorn: before 1.4.6 (fixed in 1.4.6); from 1.5.0-beta.0, before 1.5.6 (fixed in 1.5.6); from 1.6.0-alpha.0, before 1.6.0-beta.5 (fixed in 1.6.0-beta.5)

Published 2026-05-07. Last modified 2026-06-17.