CVE-2026-79917 - MaxKB: Chat share-link endpoint missing owner check: a chat token can publish another user's conversation

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MEDIUM

MaxKB: Chat share-link endpoint missing owner check: a chat token can publish another user's conversation

Published Sep 21, 2026

6.5

MEDIUM

CVSS 3.1

EPSS 0.27%

Description

MaxKB is an open-source AI assistant for enterprise. In 2.7.0 through 2.10.4-lts, POST /chat/api/{application_id}/chat/{chat_id}/share_chat verifies that a conversation exists but does not verify that it belongs to the authenticated chat_user_id or to the application bound to the caller's token. An attacker with any chat token and a known victim chat_id can create an unauthenticated public ChatShareLink exposing the victim's conversation and can create PublicFileAccess state that makes associated files retrievable without credentials, with no available revoke path. No fixed version is available as of this review.

Affected products

Vendor 1Panel-dev Product MaxKB Default
n/a
- Version
  >= 2.7.0, <= 2.10.4-lts
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

1Panel-dev

MaxKB

n/a

Version	Status	Constraints
>= 2.7.0, <= 2.10.4-lts	affected	-

Remediation

No remediation recorded yet.

Weaknesses (2)

CWE-285

CWE-639

Authorization Bypass

References (2)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-84158
Advisory
https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-m8gr-554p-8r82
x_refsource_CONFIRM

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-84158		Advisory
https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-m8gr-554p-8r82		x_refsource_CONFIRM