What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-11 · updated 2026-06-17
• Weakness: CWE-352

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.

Affected products

• nexryai concorde: before 12.25Q1.1

References

• https://github.com/nexryai/concorde/commit/2309b4a292828ddba4d57cf0e914bc433095871d
• https://github.com/nexryai/concorde/commit/f3f54bde6a37ad310f83ae46de54a286c4b74059
• https://github.com/nexryai/concorde/security/advisories/GHSA-5hgq-9vw8-7v87

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