How severe is CVE-2026-34456?

CVE-2026-34456 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-34456 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34456?

CVE-2026-34456 primarily affects Reviactyl. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-34456?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34456 have an EU (EUVD) identifier?

Yes. CVE-2026-34456 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18009.

When was CVE-2026-34456 published?

CVE-2026-34456 was published on 2026-04-01 and last updated on 2026-06-17.

CVE-2026-34456

CVE-2026-34456 is a critical-severity vulnerability in Reviactyl with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18009
Weakness: CWE-284
Affected product: Reviactyl
Published: 2026-04-01
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-34456?: 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.
How severe is CVE-2026-34456?: CVE-2026-34456 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-34456 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34456?: CVE-2026-34456 primarily affects Reviactyl. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-34456?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34456 have an EU (EUVD) identifier?: Yes. CVE-2026-34456 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18009.
When was CVE-2026-34456 published?: CVE-2026-34456 was published on 2026-04-01 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:reviactyl:reviactyl:26.2.0:beta1:*:*:*:*:*:*
cpe:2.3:a:reviactyl:reviactyl:26.2.0:beta2:*:*:*:*:*:*
cpe:2.3:a:reviactyl:reviactyl:26.2.0:beta3:*:*:*:*:*:*
cpe:2.3:a:reviactyl:reviactyl:26.2.0:beta4:*:*:*:*:*:*

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