CVE-2026-53871
CVE-2026-53871 is a high-severity vulnerability with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-565.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- CVSS v4: 8.6
- EPSS exploit prediction: 0% (29th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-37776
- Weakness: CWE-565
- Published:
- Last modified:
Description
Hermes WebUI before 0.51.368 contains an authorization bypass vulnerability in the get_profile_cookie() function that accepts unauthenticated profile names from the hermes_profile cookie. An authenticated attacker can forge the hermes_profile cookie value to bypass profile-scoped authorization checks and access sessions, files, and resources across different profiles.
Frequently asked questions
- What is CVE-2026-53871?
- Hermes WebUI before 0.51.368 contains an authorization bypass vulnerability in the get_profile_cookie() function that accepts unauthenticated profile names from the hermes_profile cookie. An authenticated attacker can forge the hermes_profile cookie value to bypass profile-scoped authorization checks and access sessions, files, and resources across different profiles.
- How severe is CVE-2026-53871?
- CVE-2026-53871 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2026-53871 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-53871?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-53871 have an EU (EUVD) identifier?
- Yes. CVE-2026-53871 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37776.
- When was CVE-2026-53871 published?
- CVE-2026-53871 was published on 2026-06-17 and last updated on 2026-06-18.
References
- https://github.com/nesquena/hermes-webui/commit/9e96f5f6adf93b6d1e27ebddfb4d2833ca06ff3b
- https://github.com/nesquena/hermes-webui/pull/4023
- https://github.com/nesquena/hermes-webui/pull/4036
- https://github.com/nesquena/hermes-webui/releases/tag/v0.51.368
- https://www.vulncheck.com/advisories/hermes-webui-profile-scoped-authorization-bypass-via-forged-hermes-profile-cookie
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