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CVE-2025-24900— Concorde CSRF vulnerability due to insecure configuration of authentication cookie attributes

Quick assessment

Affected
nexryai concorde
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Concorde（Nexkey）是nexryai个人开发者的一个应用程序。 Concorde 12.24Q4.2版本存在跨站请求伪造漏洞，该漏洞源于缺少CSRF对策和cookie设置不当，会导致攻击者可绕过MediaProxy身份验证加载任何图像。

CVSS 8.6 · High EPSS 0.40% · P32
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I. Basic Information for CVE-2025-24900

Vulnerability Information
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Vulnerability Title
Concorde CSRF vulnerability due to insecure configuration of authentication cookie attributes
Source: CVE Program / CVE List V5
Vulnerability Description
Concorde, formerly know as Nexkey, is a fork of the federated microblogging platform Misskey. Due to a lack of CSRF countermeasures and improper settings of cookies for MediaProxy authentication, there is a vulnerability that allows MediaProxy authentication to be bypassed. In versions prior to 12.25Q1.1, the authentication cookie does not have the SameSite attribute. This allows an attacker to bypass MediaProxy authentication and load any image without restrictions under certain circumstances. In versions prior to 12.24Q2.3, this cookie was also used to authenticate the job queue management page (bull-board), so bull-board authentication is also bypassed. This may enable attacks that have a significant impact on availability and integrity. The affected versions are too old to be covered by this advisory, but the maintainers of Concorde strongly recommend not using older versions. Version 12.25Q1.1 contains a patch. There is no effective workaround other than updating.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Concorde 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Concorde（Nexkey）是nexryai个人开发者的一个应用程序。 Concorde 12.24Q4.2版本存在跨站请求伪造漏洞，该漏洞源于缺少CSRF对策和cookie设置不当，会导致攻击者可绕过MediaProxy身份验证加载任何图像。
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
nexryai concorde < 12.25Q1.1 -

II. Public POCs for CVE-2025-24900

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7529 chars
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III. Intelligence Information for CVE-2025-24900

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Patches & Fixes for CVE-2025-24900 (2)

Vendor Advisories for CVE-2025-24900 (1)

IV. Related Vulnerabilities

Same product: concorde
Same vendor: nexryai
Same weakness: CWE-352

V. Comments for CVE-2025-24900

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