CVE-2025-24900 Concorde CSRF vulnerability due to insecure configuration of authentication cookie attributes
Attackers can bypass MediaProxy authentication to load images or access job queues due to missing SameSite cookie attributes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-24900?
CVE-2025-24900 is a high-severity vulnerability in nexryai concorde, published on 11 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-352
Which versions are affected by CVE-2025-24900?
How do I fix CVE-2025-24900?
No fix has been published for CVE-2025-24900 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-24900 being exploited?
There is no known exploitation of CVE-2025-24900 in the wild and no public exploit code.
Sources
Also known as GHSA-5hgq-9vw8-7v87.