What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-17 · updated 2026-10-24
• Weakness: CWE-862

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

• maybe-finance maybe: through 0.6.0

References

• https://github.com/geo-chen/oss/blob/main/maybe.md
• https://www.vulncheck.com/advisories/maybe-missing-authorization-via-hostingscontroller-show-update

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