CVE-2026-111653: 53AIHub through 0.5.3 Missing Authentication via PUT /api/enterprises/:id

Severity: medium (CVSS 5.3 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: 2026-10-16 · updated 2026-10-23
Weakness: CWE-306

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

53AIHub: through 0.5.3

References

https://github.com/53AI/53AIHub/blob/v0.5.3/api/controller/enterprise.go#L122-L160
https://github.com/53AI/53AIHub/blob/v0.5.3/api/router/api.go#L54-L66
https://hackmd.io/@hieuPenguinnn/53aihub-unauth-cross-tenant-enterprise-update
https://www.vulncheck.com/advisories/53aihub-through-0.5.3-missing-authentication-via-put-api-enterprises-id
https://hackmd.io/@hieuPenguinnn/53aihub-unauth-cross-tenant-enterprise-update

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