by Kastro
Paper/Archive/CVE-2026-111626

CVE-2026-111626

Webreaper Damselfly — Webreaper Damselfly through 4.5.3 Missing Authentication on REST API Controllers

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 38.7.387 × 207.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Damselfly≤ 4.5.3–CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

writeuphackmd.io/@hieuPenguinnn/damselfly-api-missing-authorizationwriteupgithub.com/Webreaper/Damselfly/blob/4.5.3/Damselfly.Web.Server/Controllers/UserManagementController.cs#L8-L53writeupgithub.com/Webreaper/Damselfly/blob/4.5.3/Damselfly.Web.Server/Program.cs#L238-L242refgithub.com/Webreaper/Damselfly/issues/409writeupvulncheck.com/advisories/webreaper-damselfly-through-4.5.3-missing-authentication-on-rest-api-controllers