CVE-2026-49973

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.

CVSS 4.0

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

CVSS 3.1

9.4CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

EPSS

0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-25)

CWE

CWE-306

Published

2026-06-11

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

References

• https://github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08
• https://github.com/nesquena/hermes-webui/pull/3964
• https://github.com/nesquena/hermes-webui/pull/3973
• https://github.com/nesquena/hermes-webui/releases/tag/v0.51.358
• https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settings

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