Auth bypass in Flarum Extension Manager
CVE-2026-112291
Flarum Extension Manager 2.0.0-beta.1 before 2.0.0-beta.8 lacks authentication and admin checks on the TaskResource index endpoint, allowing unauthenticated information disclosure. Remote attackers can send GET requests to /api/extension-manager-tasks to read task output revealing filesystem paths, installed extensions, versions, and PHP version.
Vulnerability class: Broken Access Control
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:L/I:N/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
- github.com/flarum/framework/blob/v2.0.0-beta.6/extensions/package-manager/src/A… (technical-description)
- github.com/flarum/framework/commit/257989e71fd8cc7ddab20f31dcde1aa760b1a08f (patch)
- github.com/flarum/framework/issues/4386 (issue-tracking)
- github.com/flarum/framework/releases/tag/v2.0.0-beta.8 (release-notes)
- www.vulncheck.com/advisories/flarum-extension-manager-2.0.0-beta.1-before-2.0.0… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-112291?
- CVE-2026-112291 is a medium-severity vulnerability in Flarum Extension Manager, classified under Missing Authorization. CVSS score: 5.3/10. Published 2026-10-19.
- How severe is CVE-2026-112291?
- Medium severity. CVSS v3 base score is 5.3 out of 10.