CVE-2026-49957: nesquena hermes-webui

Hermes WebUI < 0.51.296 Workspace Boundary Bypass via api/workspace.py

CVSS 6.3 MediumEPSS 0.0042 · 36th percentile

Published by the CVE Program (CNA: VulnCheck) at 9 Jun 2026, 16:25 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
nesquena	hermes-webui pkg:github/nesquena/hermes-webui	affected before 0.51.296 semver Other versions: affected

Identifiers

CVE-2026-49957

CNA

VulnCheck

Weakness (CWE)

CWE-22

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.3	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N	CNA (VulnCheck)Used for this record
7.7	High	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0042, the 36th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 9 Jun 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/nesquena/hermes-webui/releases/tag/v0.51.296 release-notes
github.com/nesquena/hermes-webui/pull/3731 issue-tracking
github.com/nesquena/hermes-webui/pull/3744 issue-tracking
github.com/nesquena/hermes-webui/commit/91a89fb5d5c0bf87932917f9914ad0150ea62fe4 patch
www.vulncheck.com/advisories/hermes-webui-workspace-boundary-bypass-via-api-workspace-py third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.