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CVE-2026-40935— WWBN/AVideo has CAPTCHA Bypass via Attacker-Controlled Length Parameter and Missing Token Invalidation on Failure

Quick assessment

Affected
WWBN AVideo
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.

WWBN AVideo是WWBN团队的一个由PHP编写的视频平台建站系统。 WWBN AVideo 29.0及之前版本存在安全漏洞，该漏洞源于objects/getCaptcha.php直接从查询字符串接受CAPTCHA长度且未进行限制或清理，可能导致任何未经身份验证的客户端强制服务器生成1字符CAPTCHA，结合不区分大小写的strcasecmp比较和验证失败不消耗存储的会话令牌，攻击者可轻易暴力破解任何依赖Captcha::validation的端点上的CAPTCHA。

CVSS 5.3 · Medium EPSS 0.32% · P22
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I. Basic Information for CVE-2026-40935

Vulnerability Information
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Vulnerability Title
WWBN/AVideo has CAPTCHA Bypass via Attacker-Controlled Length Parameter and Missing Token Invalidation on Failure
Source: CVE Program / CVE List V5
Vulnerability Description
WWBN AVideo is an open source video platform. In versions 29.0 and prior, `objects/getCaptcha.php` accepts the CAPTCHA length (`ql`) directly from the query string with no clamping or sanitization, letting any unauthenticated client force the server to generate a 1-character CAPTCHA word. Combined with a case-insensitive `strcasecmp` comparison over a ~33-character alphabet and the fact that failed validations do NOT consume the stored session token, an attacker can trivially brute-force the CAPTCHA on any endpoint that relies on `Captcha::validation()` (user registration, password recovery, contact form, etc.) in at most ~33 requests per session. Commit bf1c76989e6a9054be4f0eb009d68f0f2464b453 contains a fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
可猜测的验证码
Source: CVE Program / CVE List V5
Vulnerability Title
WWBN AVideo 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WWBN AVideo是WWBN团队的一个由PHP编写的视频平台建站系统。 WWBN AVideo 29.0及之前版本存在安全漏洞，该漏洞源于objects/getCaptcha.php直接从查询字符串接受CAPTCHA长度且未进行限制或清理，可能导致任何未经身份验证的客户端强制服务器生成1字符CAPTCHA，结合不区分大小写的strcasecmp比较和验证失败不消耗存储的会话令牌，攻击者可轻易暴力破解任何依赖Captcha::validation的端点上的CAPTCHA。
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
WWBN AVideo <= 29.0 -

II. Public POCs for CVE-2026-40935

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III. Intelligence Information for CVE-2026-40935

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Patches & Fixes for CVE-2026-40935 (1)

Vendor Advisories for CVE-2026-40935 (1)

Same Patch Batch · WWBN · 2026-04-21 · 19 CVEs total

CVE-2026-40911 10.0 CRITICAL WWBN AVideo YPTSocket WebSocket Broadcast Relay Leads to Unauthenticated Cross-User JavaSc
CVE-2026-41064 9.3 CRITICAL AVideo has an incomplete fix for CVE-2026-33502 (Command Injection)
CVE-2026-40909 8.7 HIGH WWBN AVideo has a Path Traversal in Locale Save Endpoint that Enables Arbitrary PHP File W
CVE-2026-41055 8.6 HIGH AVideo has an incomplete fix for CVE-2026-33039 (SSRF)
CVE-2026-40925 8.3 HIGH WWBN AVideo has CSRF in configurationUpdate.json.php Enables Full Site Configuration Takeo
CVE-2026-41058 8.1 HIGH AVideo has an incomplete fix for CVE-2026-33293 (Path Traversal) in AVideo
CVE-2026-41056 8.1 HIGH AVideos has CORS Origin Reflection with Credentials on Sensitive API Endpoints that Enable
CVE-2026-41060 7.7 HIGH AVideo's SSRF via same-domain hostname with alternate port bypasses isSSRFSafeURL
CVE-2026-40926 7.1 HIGH WWBN AVideo Vulnerable to CSRF in Admin JSON Endpoints (Category CRUD, Plugin Update Scrip
CVE-2026-41057 7.1 HIGH AVideo has CORS Origin Reflection Bypass via plugin/API/router.php and allowOrigin(true) t
CVE-2026-40907 6.5 MEDIUM WWBN AVideo has IDOR in Live Restreams list.json.php that Exposes Other Users' Stream Keys
CVE-2026-41062 6.5 MEDIUM WWBN/AVideo has an incomplete fix for a directory traversal bypass via query string in Rec
CVE-2026-40929 5.4 MEDIUM WWBN AVideo's missing CSRF protection in objects/commentDelete.json.php enables mass comme
CVE-2026-41063 5.4 MEDIUM WWBN AVideo has incomplete fix for CVE-2026-33500 (XSS)
CVE-2026-41061 5.4 MEDIUM WWBN AVideo Vulnerable to stored XSS via Unanchored Duration Regex in Video Encoder Receiv
CVE-2026-40928 5.4 MEDIUM AVideo: Missing CSRF Protection on State-Changing JSON Endpoints Enables Forced Comment Cr
CVE-2026-40908 5.3 MEDIUM WWBN AVideo has an Unauthenticated Information Disclosure via git.json.php that Exposes De
CVE-2026-41304 WWBN AVideo vulnerable to RCE caused by clonesite plugin

IV. Related Vulnerabilities

Same product: AVideo
Same vendor: WWBN
Same weakness: CWE-804

V. Comments for CVE-2026-40935

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