CVE-2026-58174Public exploitNetwork attack vector

Cross-profile file disclosure via unset session ownership

Published Jun 30, 2026 · Updated Jun 30, 2026

Authorization bypass in Hermes WebUI before 0.51.521 allows attackers to read files from another profile's workspace. The /api/session/import handler validates a named-profile workspace but creates the Session without a profile, persisting it as default-owned. An attacker able to import under a named profile and issue default-profile requests can export its transcript or reuse its identifier to read workspace files.

CVSS severity6.0
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Hermes WebUI before 0.51.521 allows attackers to read files from another profile's workspace. The /api/session/import handler validates a named-profile workspace but creates the Session without a profile, persisting it as default-owned. An attacker able to import under a named profile and issue default-profile requests can export its transcript or reuse its identifier to read workspace files.

The record

CVE
CVE-2026-58174
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
Nathan Esquenazi
Product
Hermes WebUI
Classifications
CWE-732, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.51.521

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nathan Esquenazi · Hermes WebUIversion=0 <0.51.521

Published CVSS scores

6.0VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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