Session Fixation vulnerability in the CLI login flow in nerves-hub nerveshubweb allows an unauthenticated attacker to obtain an API token…
CVE-2026-119446
Session Fixation vulnerability in the CLI login flow in nerves-hub nerveshubweb allows an unauthenticated attacker to obtain an API token for another user's account via a crafted login link. Starting a CLI login with POST /api/auth/clisession needs no authentication and returns a polling token, a confirmation URL that carries that token, and a confirmation code. When a signed-in user opens that URL and clicks Confirm, NervesHub.Accounts.verifyclisessiontoken/2 creates an API token for the user's account and stores it on the login, and the next poll of GET /api/auth/clisession/ returns it to whoever started the login. The confirmation code is only displayed and is never compared with anything, so it cannot show that the person confirming is the one who started the login. The confirm form carries a CSRF token and the page cannot be framed, so the attacker has to persuade the user to open the link and click the button themselves. This issue affects nerveshub: from 2.5.0 before 2.5.3.
Assessment
- CVSS
- 9.4 (v4.0)
- Severity
- Critical
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 10 November 2026
- Last updated
- 10 November 2026
- Affected
- nerves-hub · nerves_hub_web
- Assigner
- EEF
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
At the source
References
- https://github.com/nerves-hub/nerves_hub_web/security/advisories/GHSA-9vr9-463q-46qp
- https://cna.erlef.org/cves/CVE-2026-119446.html
- https://osv.dev/vulnerability/EEF-CVE-2026-119446
- https://github.com/nerves-hub/nerves_hub_web/commit/e6bf11a812d7aa8b69d854ba8ef02d65516f5564
- https://github.com/nerves-hub/nerves_hub_web/commit/3131f1701194b581ab4b3e5e9d81194fc9c83508
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