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CVE-2026-75833— Grav API Plugin Open Redirect via Backslash Bypass

Quick assessment

Affected
getgrav grav
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.

Grav是Grav组织开源的一款基于文件的扁平化内容管理系统。 Grav 1.0.14之前版本存在输入验证错误漏洞，该漏洞源于SsoController::sanitizeReturnTo()函数未正确处理反斜杠导致开放重定向，可能将已认证用户重定向到攻击者控制的网站，造成钓鱼攻击。

CVSS 4.2 · Medium EPSS 0.19% · P9

Affected Version Matrix 2

VendorProduct Version RangeStatus
getgrav grav < 1.0.14 affected
1.0.14 unaffected
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I. Basic Information for CVE-2026-75833

Vulnerability Information
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Vulnerability Title
Grav API Plugin Open Redirect via Backslash Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
The Grav API plugin (getgrav/grav-plugin-api, bundled with Grav 2.0's admin-next/API stack) before version 1.0.14 contains an open redirect weakness in SsoController::sanitizeReturnTo(). The function rejects a literal '//' prefix but does not account for browsers normalizing backslashes to slashes in special (http/https) schemes, so a returnTo value such as '/\evil.com' passes the guard and is later resolved by the browser as the protocol-relative URL '//evil.com'. Following a legitimate OAuth login flow, an attacker-supplied returnTo parameter could redirect an authenticated victim to an attacker-controlled site for post-login phishing. Full browser-side exploitability depends on the admin-next SPA's client-side oauth-callback handler and was not independently verified by the reporter.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A: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
Grav 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grav是Grav组织开源的一款基于文件的扁平化内容管理系统。 Grav 1.0.14之前版本存在输入验证错误漏洞，该漏洞源于SsoController::sanitizeReturnTo()函数未正确处理反斜杠导致开放重定向，可能将已认证用户重定向到攻击者控制的网站，造成钓鱼攻击。
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
getgrav grav 0 ~ 1.0.14 -

II. Public POCs for CVE-2026-75833

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III. Intelligence Information for CVE-2026-75833

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Vendor Advisories for CVE-2026-75833 (1)

Other References for CVE-2026-75833 (1)

Same Patch Batch · getgrav · 2026-08-18 · 14 CVEs total

CVE-2026-75837 9.1 CRITICAL Grav before 2.0.14 Privilege Escalation via Group Access Field
CVE-2026-75836 8.8 HIGH Grav API Plugin before 1.0.14 Missing Authorization
CVE-2026-75827 8.8 HIGH Grav before 2.0.15 Arbitrary File Write via error_log
CVE-2026-75828 8.7 HIGH Grav before 2.0.15 Stored XSS via detectXss() Quote Bypass
CVE-2026-75829 8.1 HIGH grav-plugin-api before 1.0.15 Twig SSTI via translate endpoint
CVE-2026-75831 7.6 HIGH Grav before 2.0.15 Stored XSS via audio/video source URL
CVE-2026-75830 7.1 HIGH grav-plugin-api before 1.0.15 Path Traversal via batchCopy
CVE-2026-74907 5.9 MEDIUM Grav before 2.0.15 Path Traversal via plugin-asset-map.php
CVE-2026-75107 5.4 MEDIUM Grav Form Plugin before 9.1.19 Stored XSS via Field Properties
CVE-2026-75834 5.4 MEDIUM Grav before 2.0.14 Stored XSS via Invalid UTF-8 Byte
CVE-2026-74908 4.6 MEDIUM Grav plugin-api before 1.0.15 Script Injection via SVG
CVE-2026-75832 4.3 MEDIUM Grav API Plugin before 1.0.14 Authorization Bypass
CVE-2026-75835 4.3 MEDIUM Grav API Plugin before 1.0.14 Missing Authorization

IV. Related Vulnerabilities

Same product: grav
Same vendor: getgrav
Same weakness: CWE-601

V. Comments for CVE-2026-75833

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