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Description

Hermes WebUI before 0.51.521 validates the workspace of an imported session under the active named profile but constructs the Session object without setting its profile in the /api/session/import handler, so the imported session is persisted with a null profile. Because a null profile is treated as the default profile by the profile authorization check, a user on the default profile can export the imported session transcript and use its session identifier to read files from the named profile's workspace, defeating the application's profile isolation.

PUBLISHED Reserved 2026-06-29 | Published 2026-06-30 | Updated 2026-07-14 | Assigner VulnCheck




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

MEDIUM: 6.0CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Problem types

Incorrect Permission Assignment for Critical Resource

Product status

Default status
unaffected

Any version before 0.51.521
affected

Credits

Chia Min Jun Lennon finder

References

github.com/nesquena/hermes-webui/pull/4489 exploit

github.com/nesquena/hermes-webui/releases/tag/v0.51.521 (Release Notes) release-notes

github.com/nesquena/hermes-webui/pull/4489 (Researcher PR) technical-description

github.com/nesquena/hermes-webui/pull/4506 (Maintainer PR) issue-tracking

github.com/...ommit/3d5ef4758e920ba6888d49aaa4341de214693496 (Fix Commit) patch

www.vulncheck.com/...ass-via-unset-session-profile-on-import third-party-advisory

cve.org (CVE-2026-58174)

nvd.nist.gov (CVE-2026-58174)

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