CVE-2026-22677
CVE-2026-22677 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. 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-22.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- CVSS v4: 6.0
- EPSS exploit prediction: 0% (30th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-30109
- Weakness: CWE-22
- Published:
- Last modified:
Description
Hermes WebUI prior to 0.51.44 contains a path traversal vulnerability in the session import endpoint that allows authenticated attackers to read arbitrary files by importing a crafted session with an unrestricted workspace value. Attackers can supply a blocked filesystem root in the workspace field and subsequently use relative paths in the session file API to access any file readable by the WebUI process.
Frequently asked questions
- What is CVE-2026-22677?
- Hermes WebUI prior to 0.51.44 contains a path traversal vulnerability in the session import endpoint that allows authenticated attackers to read arbitrary files by importing a crafted session with an unrestricted workspace value. Attackers can supply a blocked filesystem root in the workspace field and subsequently use relative paths in the session file API to access any file readable by the WebUI process.
- How severe is CVE-2026-22677?
- CVE-2026-22677 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2026-22677 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-22677?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-22677 have an EU (EUVD) identifier?
- Yes. CVE-2026-22677 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30109.
- When was CVE-2026-22677 published?
- CVE-2026-22677 was published on 2026-05-13 and last updated on 2026-06-17.
References
- https://github.com/nesquena/hermes-webui/commit/f00cb74f776f22f02f5eb6b39dfb389f87cc7fd3
- https://github.com/nesquena/hermes-webui/pull/2048
- https://github.com/nesquena/hermes-webui/releases/tag/v0.51.44
- https://www.vulncheck.com/advisories/hermes-webui-path-traversal-via-session-import-endpoint
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