CVE-2026-35443 NamelessMC: Forum reactions bypass the "view own topics only" restriction
Attackers can read and modify reactions on other users' topics in forums restricted to viewing own topics only.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-35443?
CVE-2026-35443 is a medium-severity missing authorization vulnerability in NamelessMC Nameless, published on 2 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
NamelessMC is website software for Minecraft servers. In version 2.2.4, `modules/Forum/classes/ForumPostReactionContext.php` only verifies that the caller can view the forum, but it does not re-enforce topic-level `view_other_topics` authorization. As a result, in forums where users may enter the forum but may only view their own topics, reactions can still be read and modified on other users' topics. Version 2.2.5 fixes the issue.
Weakness: CWE-862
Which versions are affected by CVE-2026-35443?
How do I fix CVE-2026-35443?
No fix has been published for CVE-2026-35443 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-2026-35443 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35443 exists.
Sources
Also known as GHSA-wcrf-5gcp-pf64.