Auth bypass in Webreaper Damselfly
CVE-2026-111626
Webreaper Damselfly through 4.5.3 contains an authentication bypass vulnerability that allows unauthenticated attackers to access all /api/* routes because controller authorization attributes are commented out. Attackers can send PUT /api/users with Admin roles to create administrator accounts, or POST /api/users to reset any user's password, gaining full control.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
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
- hackmd.io/@hieuPenguinnn/damselfly-api-missing-authorization (third-party-advisory)
- github.com/Webreaper/Damselfly/blob/4.5.3/Damselfly.Web.Server/Controllers/User… (technical-description)
- github.com/Webreaper/Damselfly/blob/4.5.3/Damselfly.Web.Server/Program.cs (technical-description)
- github.com/Webreaper/Damselfly/issues/409 (issue-tracking)
- VulnCheck Advisory: Webreaper Damselfly through 4.5.3 Missing Authentication on REST API Controllers (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111626?
- CVE-2026-111626 is a critical-severity vulnerability in Webreaper Damselfly, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-10-16.
- How severe is CVE-2026-111626?
- Critical severity. CVSS v3 base score is 9.8 out of 10.