CVE-2025-30223: Beego allows Reflected/Stored XSS in Beego's RenderForm() Function Due to Unescaped User Input

Severity: critical (CVSS 9.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-03-31 · updated 2026-06-17
Weakness: CWE-79

Description

Beego is an open-source web framework for the Go programming language. Prior to 2.3.6, a Cross-Site Scripting (XSS) vulnerability exists in Beego's RenderForm() function due to improper HTML escaping of user-controlled data. This vulnerability allows attackers to inject malicious JavaScript code that executes in victims' browsers, potentially leading to session hijacking, credential theft, or account takeover. The vulnerability affects any application using Beego's RenderForm() function with user-provided data. Since it is a high-level function generating an entire form markup, many developers would assume it automatically escapes attributes (the way most frameworks do). This vulnerability is fixed in 2.3.6.

Affected products

beego: before 2.3.6 — fixed in 2.3.6

How to fix

Upgrade to a fixed version: beego 2.3.6. Check the vendor advisory for mitigations.

References

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