Vulnerability · Published Jul 17, 2026 · Assigned by VulnCheck

CVE-2026-63100Maybe 0.6.0 Missing Authorization via HostingsController show/update

Medium 6.5

In plain English

A medium-severity missing authorization in maybe from maybe-finance. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 70.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
maybe-finance	maybe	0 – through 0.6.0

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Researcher Disclosure technical-description, exploit
https://www.vulncheck.com/advisories/maybe-missing-authorization-via-hostingscontroller-show-update third-party-advisory