CVE-2026-111626CWE-306

CVE-2026-111626

Critical · published October 16, 2026

CVSS v3.1
9.8
EPSS
0%
Percentile
37.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00445 · 37.8th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-10-16T22:17Z
References (5)
https://github.com/Webreaper/Damselfly/blob/4.5.3/Damselfly.Web.Server/Controllers/UserManagementController.cs#L8-L53 · [email protected]https://github.com/Webreaper/Damselfly/blob/4.5.3/Damselfly.Web.Server/Program.cs#L238-L242 · [email protected]https://github.com/Webreaper/Damselfly/issues/409 · [email protected]https://hackmd.io/@hieuPenguinnn/damselfly-api-missing-authorization · [email protected]https://www.vulncheck.com/advisories/webreaper-damselfly-through-4.5.3-missing-authentication-on-rest-api-controllers · [email protected]
EPSS history
Timeline
  • 18 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 16 OCT 17:39Z
    Webreaper Damselfly through 4.5.3 Missing Authentication on REST API Controllers
    cvelistv5
  • 16 OCT 17:39Z
    Webreaper Damselfly through 4.5.3 Missing Authentication on REST API Controllers
    cvelistv5