Critical severity · published Oct 16, 2026
CVE-2026-111626
Webreaper Damselfly through 4.5.3 Missing Authentication on REST API Controllers
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DA
Damselfly · Webreaper
through 4.5.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111626
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111626
github.com
https://github.com/Webreaper/Damselfly/blob/4.5.3/Damselfly.Web.Server/Controllers/UserManagementController.cs#L8-L53
github.com
https://github.com/Webreaper/Damselfly/blob/4.5.3/Damselfly.Web.Server/Program.cs#L238-L242
github.com
https://github.com/Webreaper/Damselfly/issues/409
hackmd.io
https://hackmd.io/@hieuPenguinnn/damselfly-api-missing-authorization
www.vulncheck.com
https://www.vulncheck.com/advisories/webreaper-damselfly-through-4.5.3-missing-authentication-on-rest-api-controllers