CVE-2026-42844Public exploitNetwork attack vector

Super-admin escalation via arbitrary account YAML upload

Published May 12, 2026 · Updated May 12, 2026

Privilege escalation in Grav 2.0.0-beta.2 allows remote authenticated users with api.media.write to obtain API super-admin access. The blueprint-upload controller trusts caller-supplied destination and scope values, resolves self@: with users/anything to user/accounts/, and writes an uploaded YAML account file without blocking that target or file type. Media-upload permission alone therefore permits a new account with api.super to control content, configuration, users, packages, and system administration.

CVSS severity8.7
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Grav 2.0.0-beta.2 allows remote authenticated users with api.media.write to obtain API super-admin access. The blueprint-upload controller trusts caller-supplied destination and scope values, resolves self@: with users/anything to user/accounts/, and writes an uploaded YAML account file without blocking that target or file type. Media-upload permission alone therefore permits a new account with api.super to control content, configuration, users, packages, and system administration.

The record

CVE
CVE-2026-42844
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-434, CWE-269, T1136, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 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=2.0.0-beta.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grav · Gravversion=2.0.0-beta.2

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-269Improper Privilege Management
T1136Create Account
T1068Exploitation for Privilege Escalation

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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