CVE-2026-58654Public exploitNetwork attack vector

Authenticated arbitrary file upload via MIME trust

Published Jul 8, 2026 · Updated Jul 8, 2026

Unrestricted file upload in Grav API plugin 1.0.0 allows remote authenticated users to store arbitrary content through the avatar endpoint. UsersController trusts getClientMediaType(), accepts any image/* declaration, and moves the uninspected body into user/accounts/avatars/ under a predictable name. Any account with site.login can write PHP, SVG, or polyglot files, but direct HTTP access remains blocked unless another flaw or server misconfiguration exposes them.

CVSS severity5.3
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Grav API plugin 1.0.0 allows remote authenticated users to store arbitrary content through the avatar endpoint. UsersController trusts getClientMediaType(), accepts any image/* declaration, and moves the uninspected body into user/accounts/avatars/ under a predictable name. Any account with site.login can write PHP, SVG, or polyglot files, but direct HTTP access remains blocked unless another flaw or server misconfiguration exposes them.

The record

CVE
CVE-2026-58654
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
Grav
Product
Grav
Classifications
CWE-434, T1105
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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=0 <1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grav · Gravversion=0 <1.0.1

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/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
T1105Ingress Tool Transfer

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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