CVE-2026-100523— Cotonti through 1.0.0 Open Redirect via message.php redirect parameter
Quick assessment
Affected
Cotonti Cotonti
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.
Cotonti 1.0.0 及之前版本中存在一个开放重定向漏洞，该漏洞位于 message.php 文件中，其重定向参数以 Base64 解码，但未进行域名验证。未认证的攻击者可以构造包含编码外部 URL 的恶意链接，通过 meta refresh 标签将用户重定向到任意网站，从而用于网络钓鱼攻击。
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I. Basic Information for CVE-2026-100523
Vulnerability Information
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Vulnerability Title
Cotonti through 1.0.0 Open Redirect via message.php redirect parameter
Source: CVE Program / CVE List V5
Vulnerability Description
Cotonti through 1.0.0 contains an open redirect vulnerability in message.php that base64-decodes the redirect parameter without domain validation. Unauthenticated attackers can craft malicious links with encoded external URLs to redirect users to arbitrary sites via meta refresh tags for phishing attacks.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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
II. Public POCs for CVE-2026-100523
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-100523 (1)
Vendor Pages for CVE-2026-100523 (1)
Other References for CVE-2026-100523 (4)
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https://github.com/Cotonti/Cotonti/issues/1907 issue-tracking
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https://github.com/Cotonti/Cotonti/blob/1.0.0/system/common.php technical-description
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https://github.com/Cotonti/Cotonti/blob/1.0.0/message.php technical-description
Same Patch Batch · Cotonti · 2026-09-26 · 4 CVEs total
| CVE-2026-100522 | 6.1 MEDIUM | Cotonti through 1.0.0 Reflected XSS via message.php lng parameter |
| CVE-2026-100521 | 6.1 MEDIUM | Cotonti through 1.0.0 Reflected XSS via search highlight parameter |
| CVE-2026-100524 | 5.4 MEDIUM | Cotonti through 1.0.0 Cross-Site Request Forgery via Extensions Manager |
IV. Related Vulnerabilities
Same product: Cotonti
-
CVE-2026-100524
Cotonti through 1.0.0 Cross-Site Request Forgery via Extensi -
CVE-2026-100522
Cotonti through 1.0.0 Reflected XSS via message.php lng para -
CVE-2026-100521
Cotonti through 1.0.0 Reflected XSS via search highlight par -
CVE-2026-93873
Cotonti through 1.0.0 Cross-Site Request Forgery in the Cont -
CVE-2026-93872
Cotonti 1.0.0 PHP Object Injection via Comments Plugin Edit
Same vendor: Cotonti
-
CVE-2026-100524
Cotonti through 1.0.0 Cross-Site Request Forgery via Extensi -
CVE-2026-100522
Cotonti through 1.0.0 Reflected XSS via message.php lng para -
CVE-2026-100521
Cotonti through 1.0.0 Reflected XSS via search highlight par -
CVE-2026-93873
Cotonti through 1.0.0 Cross-Site Request Forgery in the Cont -
CVE-2026-93872
Cotonti 1.0.0 PHP Object Injection via Comments Plugin Edit
Same weakness: CWE-601
-
CVE-2026-101090
Nezha through 2.2.3 Host Header Injection via OAuth2 redirec -
CVE-2026-97165
Joomla Extension - svenbluege.de - Reflected XSS and open re -
CVE-2026-97325
YunaiV/zhijiantianya ruoyi-vue-pro OAuth2 Client OAuth2Clien -
CVE-2026-96892
Edimax BR-6428nC goform websRedirect redirect -
CVE-2026-96773
Intelliants Subrion CMS Login Page login.php authorize redir
V. Comments for CVE-2026-100523
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