# CVE-2026-125364: frab through 0.9.1 Privilege Escalation via conference_users_attributes in UsersController

Status: published. Published: 2026-11-09. Updated: 2026-11-09.

frab through 0.9.1 contains a privilege escalation vulnerability that allows authenticated crew users to grant themselves orga roles by submitting unchecked nested conference_users_attributes. Attackers can abuse UsersController#update or #create, which skip filter_conference_users, to gain orga on any conference and fully manage its events, schedule, reviewers and crew.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/frab/frab/commit/8d14d491ac73f2e19030e95a86b6575106270eeb

## Affected products and versions

- frab / frab: ≥ 0; ≤ 0.9.1 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.6 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-269

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/frab/frab/issues/1053 (CNA: VulnCheck; issue-tracking)

- https://github.com/frab/frab (CNA: VulnCheck; product)

- https://github.com/frab/frab/blob/0.9.1/app/controllers/users_controller.rb#L51 (CNA: VulnCheck; technical-description)

- https://github.com/frab/frab/commit/8d14d491ac73f2e19030e95a86b6575106270eeb (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/frab-through-0.9.1-privilege-escalation-via-conference-users-attributes-in-userscontroller (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-125364; retrieved 2026-11-10; source updated 2026-11-09

Revision: 0ed69c3c6904db7b6dd7691f1bd112c98bed21f886c54c3ba28b30187f933319

Canonical: https://y2.dev/cve/CVE-2026-125364

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