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CVE-2026-42259— Saltcorn: Open Redirect in `POST /auth/login` due to incomplete `is_relative_url` validation (backslash bypass)

Quick assessment

Affected
saltcorn saltcorn
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Saltcorn是Saltcorn开源的一个可扩展的开源无代码数据库应用程序构建器。 Saltcorn 1.4.6之前版本、1.5.6之前版本和1.6.0-beta.5之前版本存在输入验证错误漏洞，该漏洞源于登录后dest参数验证仅阻止:/和//，但WHATWG兼容浏览器将反斜杠规范化为正斜杠，可能导致跨域重定向到攻击者控制的域名。

AI Predicted 6.1 Difficulty: Easy EPSS 0.34% · P27

Affected Version Matrix 3

VendorProduct Version RangeStatus
saltcorn saltcorn < 1.4.6 affected
>= 1.5.0-beta.0, < 1.5.6 affected
>= 1.6.0-alpha.0, < 1.6.0-beta.5 affected
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I. Basic Information for CVE-2026-42259

Vulnerability Information
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Vulnerability Title
Saltcorn: Open Redirect in `POST /auth/login` due to incomplete `is_relative_url` validation (backslash bypass)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Saltcorn 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Saltcorn是Saltcorn开源的一个可扩展的开源无代码数据库应用程序构建器。 Saltcorn 1.4.6之前版本、1.5.6之前版本和1.6.0-beta.5之前版本存在输入验证错误漏洞，该漏洞源于登录后dest参数验证仅阻止:/和//，但WHATWG兼容浏览器将反斜杠规范化为正斜杠，可能导致跨域重定向到攻击者控制的域名。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
saltcorn saltcorn < 1.4.6 -

II. Public POCs for CVE-2026-42259

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III. Intelligence Information for CVE-2026-42259

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Vendor Advisories for CVE-2026-42259 (1)

IV. Related Vulnerabilities

Same product: saltcorn
Same vendor: saltcorn
Same weakness: CWE-601

V. Comments for CVE-2026-42259

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