CVE-2026-34456: Reviactyl is an open-source game server management panel built using Laravel, React, FilamentPHP, Vite, and Go

This month

CRITICAL 9.1REMOTEDOWNGRADE

CVE-2026-34456 is a critical-severity flaw (CVSS 9.1) affecting reviactyl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 th

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-04-01
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: reviactyl

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-01 20:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

reviactyl reviactyl DOWNGRADE

Affected: 26.2.0 beta1 · 26.2.0 beta2 · 26.2.0 beta3 · 26.2.0 beta4

Fixed in: no fixed release known

Safe to downgrade to: a release before 26.2.0

1. Check installed version

apt-cache policy reviactyl || rpm -q reviactyl || reviactyl --version

2. No fixed release: DOWNGRADE to a release before 26.2.0 (Debian / Ubuntu)

apt-cache madison reviactyl sudo apt install reviactyl=<VERSION_BEFORE_26.2.0> sudo apt-mark hold reviactyl

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list reviactyl sudo dnf downgrade reviactyl-<VERSION_BEFORE_26.2.0> sudo dnf versionlock add reviactyl

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34456?

reviactyl: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-34456 being exploited?

CVE-2026-34456 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34456 affect?

CVE-2026-34456 affects reviactyl. Severity is critical (CVSS 9.1). 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 l

How urgent is CVE-2026-34456?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Laravel vulnerabilities · React vulnerabilities · GitHub vulnerabilities · Discord vulnerabilities

References

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