CVE-2026-42843Public exploitNetwork attack vector

Super Administrator escalation via self-editable access field

Published May 11, 2026 · Updated May 11, 2026

Incorrect authorization in Grav API Plugin before 1.0.0-beta.15 allows remote authenticated users to become Super Administrators. UsersController::update accepts self-profile PATCH requests with only api.access, then copies the unprotected access field into the user's permission object. A basic API account is sufficient to grant admin.super and api.super, enabling content or configuration changes and server-side code execution through administrator features.

CVSS severity8.8
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Grav API Plugin before 1.0.0-beta.15 allows remote authenticated users to become Super Administrators. UsersController::update accepts self-profile PATCH requests with only api.access, then copies the unprotected access field into the user's permission object. A basic API account is sufficient to grant admin.super and api.super, enabling content or configuration changes and server-side code execution through administrator features.

The record

CVE
CVE-2026-42843
Published
May 11, 2026
Updated
May 11, 2026
Vendor
Grav
Product
Grav API Plugin
Classifications
CWE-863, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=< 1.0.0-beta.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grav · Grav API Pluginversion=< 1.0.0-beta.15

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1098Account Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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