Unauthenticated initial setup takeover in Hermes WebUI
CVE-2026-49973 is an improper access control vulnerability in Hermes WebUI before version 0.51.358. During the first-run setup flow, the settings API endpoint accepts the _set_password parameter without enforcing appropriate authentication or network-origin restrictions. An unauthenticated remote attacker on any reachable network can send a POST request to the settings endpoint during this initialization window, set an arbitrary password hash, and complete takeover of the initial setup process. The issue effectively exposes privileged setup functionality to unauthenticated users before the legitimate operator finishes provisioning the instance.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.