CVE-2026-33209— Avo has a XSS vulnerability on `return_to` param
Quick assessment
Affected
avo-hq avo
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.
Avo是Avo开源的一个开源的 ruby on rails 管理面板创建框架。 Avo 3.30.3之前版本存在跨站脚本漏洞，该漏洞源于avo接口中return_to查询参数存在反射型跨站脚本，可能导致攻击者注入并执行任意JavaScript。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-33209
Vulnerability Information
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Vulnerability Title
Avo has a XSS vulnerability on `return_to` param
Source: CVE Program / CVE List V5
Vulnerability Description
Avo is a framework to create admin panels for Ruby on Rails apps. Prior to version 3.30.3, a reflected cross-site scripting (XSS) vulnerability exists in the return_to query parameter used in the avo interface. An attacker can craft a malicious URL that injects arbitrary JavaScript, which is executed when he clicks a dynamically generated navigation button. This issue has been patched in version 3.30.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Avo 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Avo是Avo开源的一个开源的 ruby on rails 管理面板创建框架。 Avo 3.30.3之前版本存在跨站脚本漏洞，该漏洞源于avo接口中return_to查询参数存在反射型跨站脚本，可能导致攻击者注入并执行任意JavaScript。
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
II. Public POCs for CVE-2026-33209
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Patches & Fixes for CVE-2026-33209 (2)
-
fix: `return_to` parameter (#4330) · avo-hq/avo@4453d39 · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-33209 (1)
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XSS vulnerability on return_to param · Advisory · avo-hq/avo · GitHub x_refsource_CONFIRM
Vendor Pages for CVE-2026-33209 (1)
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Release Release v3.30.3 · avo-hq/avo · GitHub x_refsource_MISC
IV. Related Vulnerabilities
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CVE-2024-22411
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CVE-2024-22191
Stored cross-site scripting (XSS) in `key_value` field in Av
Same vendor: avo-hq
-
CVE-2026-53769
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Avo: Missing Authorization in Avo Association Attach Endpoin -
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Cross site scripting in Action messages on Avo -
CVE-2024-22191
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Same weakness: CWE-79
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V. Comments for CVE-2026-33209
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