Is there a public exploit for CVE-2026-66885?

No public exploit for CVE-2026-66885 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-66885?

CVE-2026-66885 scores CVSS 6.8 (v4.0), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.24%.

What does CVE-2026-66885 affect?

CVE-2026-66885 affects livebook-dev livebook.

6.8 Medium

Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session…

CVE-2026-66885

Cross-Site Request Forgery (CSRF) vulnerability in livebook-dev livebook allows an attacker to authenticate a victim's browser session under the attacker's own Livebook Teams identity. When Livebook is configured to use Livebook Teams for identity, Livebook.ZTA.LivebookTeams.handlerequest/4 in lib/livebook/zta/livebookteams.ex handles the OAuth-style callback carrying a teamsidentity marker and a code parameter. The clause exchanges that code for an access token and writes the token into the browser session without verifying any value that ties the callback to the browser session that started the login. No state or nonce is generated when the flow is initiated: Livebook.Teams.Requests.createauthrequest/1 in lib/livebook/teams/requests.ex sends an empty request body, so no per-attempt value is ever registered, and the callback clause has nothing to compare against. An attacker who holds membership in the same Livebook Teams organisation as the target instance can therefore begin the login flow themselves, retain the resulting authorization code without redeeming it, and induce a victim to open a crafted URL carrying that code. The victim's browser completes the exchange and the…

Assessment

CVSS: 6.8 (v4.0)
Severity: Medium
EPSS: 0.24% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 5 August 2026
Last updated: 10 November 2026
Affected: livebook-dev · livebook
Assigner: EEF

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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