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CVE-2026-75628— Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter

Quick assessment

Affected
CVE-2026-75628
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.

Perl 版本的 Punk::OAuth2（低于 0.03 版本）在用户登录后允许攻击者选择的外部重定向，原因是 same_origin_path 函数未正确拒绝返回参数中的反斜杠（backslash）或制表符（tab）。 具体流程如下：oauth2_login 从初始请求中读取 return 参数，对该参数执行 same_origin_path 检查，并将通过检查的值存储在会话流程记录中，作为登录后的重定向目标。该检查机制会拒绝以下三类值：不以斜杠（/）开头的、第二个字节为斜杠的、或包含回车符（CR）或换行符（L

AI Predicted 6.1 Difficulty: Trivial EPSS 0.26% · P18

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 0.03 affected

I. Basic Information for CVE-2026-75628

Vulnerability Information
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Vulnerability Title
Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter
Source: CVE Program / CVE List V5
Vulnerability Description
Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter. oauth2_login reads the return parameter from the initiation request, runs same_origin_path over it, and stores the survivor in the session flow record as the post-login redirect target. That check rejects a value that does not begin with a slash, one with a slash as its second byte, and one containing CR or LF. A backslash and a tab pass. The URL Standard treats a backslash as equivalent to a slash for special schemes, so `/\evil.example` parses with the authority `evil.example`. It also strips ASCII tab before parsing, so a tab between two leading slashes leaves `//evil.example`. A crafted link to the application's own login route lands the victim on the attacker's site after a genuine authentication. The redirect carries no authorization code or access token.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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
- - 0 ~ 0.03 -

II. Public POCs for CVE-2026-75628

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III. Intelligence Information for CVE-2026-75628

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Other References for CVE-2026-75628 (2)

IV. Related Vulnerabilities

Same weakness: CWE-601

V. Comments for CVE-2026-75628

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