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CVE-2026-55840— Scoold: Open Redirect in getBackToUrl() allows phishing via domain-prefix startsWith bypass

Quick assessment

Affected
Erudika scoold
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.

Scoold 是一个面向团队的问答与知识共享平台。在 1.69.1 版本之前，位于 中的 方法在验证 和 参数时，仅使用 检查这些参数是否以配置的服务器 URL 开头。攻击者可构造一个绝对 URL，其主机名以合法主机名开头，从而使得 保留该恶意 URL，同时前缀检查也会将其视为合法。用户在认证成功后，若点击该恶意构造的登录链接，将被重定向到攻击者控制的域名，从而导致钓鱼攻击，并可能造成用户凭据或令牌被盗。该问题已在 1.69.1 版本中修复。

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1566.001 · Spearphishing Attachment

Affected Version Matrix 1

VendorProduct Version RangeStatus
Erudika scoold < 1.69.1 affected
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I. Basic Information for CVE-2026-55840

Vulnerability Information
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Vulnerability Title
Scoold: Open Redirect in getBackToUrl() allows phishing via domain-prefix startsWith bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Scoold is a Q&A and a knowledge sharing platform for teams. Prior to 1.69.1, the getBackToUrl() method in src/main/java/com/erudika/scoold/utils/HttpUtils.java validates the backto and returnto parameters with Strings.CI.startsWith against the configured server URL. An attacker can supply an absolute URL whose hostname begins with the legitimate hostname, causing URI.resolve() to retain the attacker URL and the prefix check to accept it. A victim who follows the crafted sign-in link can be redirected to an attacker-controlled domain after authentication, enabling phishing and possible credential or token theft. This issue is fixed in version 1.69.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Erudika scoold < 1.69.1 -

II. Public POCs for CVE-2026-55840

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III. Intelligence Information for CVE-2026-55840

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Other References for CVE-2026-55840 (3)

Same Patch Batch · Erudika · 2026-10-15 · 3 CVEs total

CVE-2026-57183 6.1 MEDIUM Scoold: Forged JWT Accepted as Admin API Token Allowing Unauthorized Access to Sensitive C
CVE-2026-55842 5.4 MEDIUM Scoold: CORS wildcard origin with credentials enabled allows cross-origin authenticated AP

IV. Related Vulnerabilities

Same product: scoold
Same vendor: Erudika
Same weakness: CWE-601

V. Comments for CVE-2026-55840

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