Vulnerability · Published Oct 16, 2026 · Assigned by VulnCheck

CVE-2026-11165353AIHub through 0.5.3 Missing Authentication via PUT /api/enterprises/:id

Medium 5.3

In plain English

A medium-severity missing authentication in 53AIHub from 53AI. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 61.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
53AI	53AIHub	0 – through 0.5.3

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

https://hackmd.io/@hieuPenguinnn/53aihub-unauth-cross-tenant-enterprise-update third-party-advisory
https://github.com/53AI/53AIHub/blob/v0.5.3/api/router/api.go#L54-L66 technical-description
https://github.com/53AI/53AIHub/blob/v0.5.3/api/controller/enterprise.go#L122-L160 technical-description
VulnCheck Advisory: 53AIHub through 0.5.3 Missing Authentication via PUT /api/enterprises/:id third-party-advisory