Quick answers
- Is CVE-2026-42337 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-42337 being exploited in the wild.
- How severe is CVE-2026-42337?
- Informational severity, with a CVSS score of 5.3, published 26 May 2026.
- Which products and versions are affected?
- 1Panel-dev MaxKB <= 2.8.0.
- Is there a fix for CVE-2026-42337?
- A patch was published on 2026-05-26: Fix released in version 2.8.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-42337 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-42337?
- Check whether you run 1Panel-dev MaxKB at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A broken access control vulnerability exists in the MaxKB OSS file service URL fetch API endpoint (/chat/api/oss/get_url). The GetUrlView.get() method extracts the application_id parameter directly from the URL path and passes it to the get_url_content() function without verifying if the authenticated user's token has permission to access that specific application. This allows an authenticated attacker to perform cross-application privilege bypass by supplying an arbitrary application ID. The system then loads the target application's policy and performs URL fetch operations within that unauthorized context. The issue is resolved in version 2.8.1 by enforcing application ownership validation at the view layer.
Affected products
- 1Panel-dev MaxKB <= 2.8.0
Timeline
- 2026-05-07: advisory: GitHub Security Advisory published by vendor
- 2026-05-26: disclosed: CVE published to NVD
- 2026-05-26: patched: Fix released in version 2.8.1