CVE-2026-77826Network attack vector

Unauthenticated account access via unvalidated token audience

Published Sep 5, 2026 · Updated Sep 6, 2026

Improper authentication in Metagauss RegistrationMagic 5.0.1.8 through 6.0.9.8 allows remote attackers to access accounts via Facebook tokens. The Facebook login handler accepts an access token as proof of identity without verifying that its audience matches the site's configured Facebook application. Attackers must obtain a token issued to another Facebook application; the flaw permits login as the matching user or creation of a new account even when registration is disabled.

CVSS severity8.8
High
EPSS probability0.27%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Metagauss RegistrationMagic 5.0.1.8 through 6.0.9.8 allows remote attackers to access accounts via Facebook tokens. The Facebook login handler accepts an access token as proof of identity without verifying that its audience matches the site's configured Facebook application. Attackers must obtain a token issued to another Facebook application; the flaw permits login as the matching user or creation of a new account even when registration is disabled.

The record

CVE
CVE-2026-77826
Published
Sep 5, 2026
Updated
Sep 6, 2026
Vendor
EventPrime Events
Product
RegistrationMagic
Classifications
CWE-287, T1078, T1136.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0.1.8 <6.0.9.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EventPrime Events · RegistrationMagicversion=5.0.1.8 <6.0.9.9

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
T1078Valid Accounts
T1136.001Local Account

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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