CVE-2026-40314 NamelessMC: Reactions on private or blocking profile posts can be read and modified without proper authorization
Unauthenticated users can read private profile reactions, and low-privileged users can modify them, bypassing visibility restrictions in NamelessMC.
- 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-2026-40314?
CVE-2026-40314 is a medium-severity missing authorization vulnerability in NamelessMC Nameless, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
NamelessMC is website software for Minecraft servers. In version 2.2.4,`core/classes/Misc/ProfilePostReactionContext.php` only verifies that the wall post exists and does not enforce blocked/private-profile visibility. `modules/Core/queries/reactions.php` allows unauthenticated GET requests for reaction details. This means that unauthenticated visitors can read reaction participants and timestamps for private profile posts and uthenticated low-privileged users can add reactions to private or blocking profile posts. Version 2.2.5 fixes the issue.
Weakness: CWE-862
Which versions are affected by CVE-2026-40314?
How do I fix CVE-2026-40314?
No fix has been published for CVE-2026-40314 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-40314 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40314 exists.
Sources
Also known as GHSA-55q9-8qm3-4grc.