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CVE-2025-24900

8.6 · HIGH

Concorde, formerly know as Nexkey, is a fork of the federated microblogging platform Misskey.

Published Feb 11, 2025CWE-352EPSS 0.40%

Overview

CVE-2025-24900 is a high-severity vulnerability. It was published on February 11, 2025 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/nexryai/concorde/commit/2309b4a292828ddba4d57cf0e914bc433095871dGitHubgithub.com/nexryai/concorde/commit/f3f54bde6a37ad310f83ae46de54a286c4b74059GitHubgithub.com/nexryai/concorde/security/advisories/GHSA-5hgq-9vw8-7v87

How CyberStrike helps

Frequently asked questions

What is CVE-2025-24900?

CVE-2025-24900 is a high-severity vulnerability. It was published on February 11, 2025 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2025-24900?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-24900?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-24900?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-24900 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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