PT-2026-56444 · Grav · Grav

Nicl4Ssic · Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-58654

Mitre

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

The Grav API plugin (getgrav/grav-plugin-api) 1.0.0 contains an unrestricted file upload vulnerability in the avatar upload endpoint (/api/v1/users/user/avatar). The endpoint validates only the client-declared MIME type (getClientMediaType) beginning with 'image/' and does not inspect the actual file content or restrict the resulting extension, allowing an authenticated user to store arbitrary content — including PHP code, SVG with embedded JavaScript, and polyglot payloads — under user/accounts/avatars/ with predictable filenames. Direct HTTP access to the stored files is blocked by .htaccess (returns 403), but the files persist on disk and could lead to remote code execution or stored XSS in the presence of a path traversal flaw or server misconfiguration. Fixed in 1.0.1.

Exploit

Fix

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2026-58654

Affected Products

Grav

References · 3

• 🔥 https://github.com/getgrav/grav/security/advisories/GHSA-xc64-vh46-vph6 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-58654 · Security Note
• https://vulncheck.com/advisories/grav-arbitrary-file-upload-via-avatar-endpoint · Note