CVE-2026-53871
HIGHDescription
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 to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 29% of all known CVEs.
References
Related Vulnerabilities
Other CWE-565 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2026-0257 | Critical | 9.1 | 94% | KEV + Ransom | Fix |
| CVE-2023-35885 | Critical | 9.8 | 75% | - | Fix |
| CVE-2025-64447 | High | 8.1 | 8.4% | - | - |
| CVE-2008-5784 | Critical | 9.8 | 7.1% | - | - |
| CVE-2020-7070 | Medium | 4.3 | 5.0% | - | Fix |
| CVE-2025-65212 | Critical | 9.8 | 4.7% | - | Fix |
Common questions
How do I fix CVE-2026-53871?
No published fix for CVE-2026-53871 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-53871 being actively exploited?
Not that we know of. CVE-2026-53871 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.36% is the estimated probability that it will be exploited in the next 30 days. That is higher than 29% of all scored CVEs.
How severe is CVE-2026-53871?
CVE-2026-53871 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-18.