by Kastro
Paper/Archive/CVE-2026-49973

CVE-2026-49973

nesquena hermes-webui — Hermes WebUI < 0.51.358 Unauthenticated Password Takeover via /api/settings

EPSS 0.5%public exploitCVSS 9.4
critical.is priorityof 100
47
CVSS 9.4 (CNA)9.4 / 10 × 3028.2Not in CISA KEV+300.0EPSS percentile 45.7.457 × 209.1Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.

Affected

ProductAffectedFixed inSource
hermes-webui< 0.51.3580.51.358CNA

Scores by source

VulnCheck (CNA)9.4CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
VulnCheck (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

refgithub.com/nesquena/hermes-webui/releases/tag/v0.51.358exploitgithub.com/nesquena/hermes-webui/pull/3964refgithub.com/nesquena/hermes-webui/pull/3973patchgithub.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08writeupvulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settings