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CVE-2026-29794— Vikunja has Rate-Limit Bypass for Unauthenticated Users via Spoofed Headers

Quick assessment

Affected
go-vikunja vikunja
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.

Vikunja是Vikunja开源的一个待办事项应用程序。 Vikunja 0.8至2.2.0之前版本存在安全漏洞，该漏洞源于速率限制依赖RealIP值，可能导致未经验证的用户通过伪造标头绕过速率限制，进而对端点进行暴力破解。

CVSS 5.3 · Medium EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1110.001 · Password Guessing
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I. Basic Information for CVE-2026-29794

Vulnerability Information
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Vulnerability Title
Vikunja has Rate-Limit Bypass for Unauthenticated Users via Spoofed Headers
Source: CVE Program / CVE List V5
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. Starting in version 0.8 and prior to version 2.2.0, unauthenticated users are able to bypass the application's built-in rate-limits by spoofing the `X-Forwarded-For` or `X-Real-IP` headers due to the rate-limit relying on the value of `(echo.Context).RealIP`. Unauthenticated users can abuse endpoints available to them for different potential impacts. The immediate concern would be brute-forcing usernames or specific accounts' passwords. This bypass allows unlimited requests against unauthenticated endpoints. Version 2.2.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在安全决策中依赖未经信任的输入
Source: CVE Program / CVE List V5
Vulnerability Title
Vikunja 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vikunja是Vikunja开源的一个待办事项应用程序。 Vikunja 0.8至2.2.0之前版本存在安全漏洞，该漏洞源于速率限制依赖RealIP值，可能导致未经验证的用户通过伪造标头绕过速率限制，进而对端点进行暴力破解。
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
go-vikunja vikunja >= 0.8, < 2.2.0 -

II. Public POCs for CVE-2026-29794

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III. Intelligence Information for CVE-2026-29794

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Vendor Advisories for CVE-2026-29794 (1)

Vendor Pages for CVE-2026-29794 (1)

IV. Related Vulnerabilities

Same product: vikunja
Same vendor: go-vikunja
Same weakness: CWE-807

V. Comments for CVE-2026-29794

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