CVE-2026-63100 Maybe 0.6.0 Missing Authorization via HostingsController show/update
Low-privilege users can access and modify global hosting settings, exposing API keys and altering registration controls due to missing authorization checks.
- 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-2026-63100?
CVE-2026-63100 is a high-severity missing authorization vulnerability in maybe-finance maybe, published on 17 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Maybe through 0.6.0 contains a missing authorization vulnerability that allows authenticated low-privilege member-role users to access and modify global hosting settings by exploiting unprotected show and update actions in the Settings::HostingsController, where the before_action ensure_admin filter is applied only to the clear_cache action. Attackers can read the operator's Synth API key rendered in plaintext via a form field value attribute, overwrite it with an attacker-controlled value, toggle public registration settings, and disable email confirmation requirements to disrupt the entire instance.
Weakness: CWE-862
Which versions are affected by CVE-2026-63100?
How do I fix CVE-2026-63100?
No fix has been published for CVE-2026-63100 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-2026-63100 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63100 exists.
Sources
Also known as GHSA-xhqm-9834-m8hg.