What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-09 · updated 2026-07-23
• Weakness: CWE-862

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.

Affected products

• nesquena hermes-webui: before 0.51.269 — fixed in 0.51.269

How to fix

Upgrade to a fixed version: nesquena hermes-webui 0.51.269. Check the vendor advisory for mitigations.

References

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

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