Auth bypass in 53ai 53aihub
CVE-2026-111653
53AIHub through 0.5.3 contains a missing authentication vulnerability that allows unauthenticated attackers to overwrite any enterprise's profile by sending PUT requests to /api/enterprises/:id. Because UpdateEnterprise only enforces checks when IS_SAAS is true, attackers can enumerate sequential enterprise IDs and overwrite logos, display names and branding for defacement and phishing.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/53aihub-unauth-cross-tenant-enterprise-update (third-party-advisory)
- github.com/53AI/53AIHub/blob/v0.5.3/api/router/api.go (technical-description)
- github.com/53AI/53AIHub/blob/v0.5.3/api/controller/enterprise.go (technical-description)
- www.vulncheck.com/advisories/53aihub-through-0.5.3-missing-authentication-via-p… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111653?
- CVE-2026-111653 is a medium-severity vulnerability in 53ai 53aihub, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-10-16.
- How severe is CVE-2026-111653?
- Medium severity. CVSS v3 base score is 5.3 out of 10.