CVE-2026-58656 | Grav API plugin before v1.0.0-rc.16 accepts JWT tokens via t… | CVSS 7.5 HIGH

Description

Grav API plugin before v1.0.0-rc.16 accepts JWT tokens via the ?token= URL query parameter and responds with Access-Control-Allow-Origin: *, allowing unauthenticated attackers to make fully authenticated cross-origin API requests from any malicious website. Attackers who obtain a leaked JWT token from access logs, proxy logs, browser history, or Referrer headers can create persistent backdoor super-admin accounts and exfiltrate sensitive configuration and user data.

Metadata

CVE ID: CVE-2026-58656
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-01 21:54 UTC
Published: 2026-07-08 13:49 UTC
Last updated: 2026-07-08 15:44 UTC
Primary CWE: CWE-598
Use of GET Request Method With Sensitive Query Strings
Vendor / Product: getgrav / grav
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
getgrav	grav	—	0 ≤ 1.0.0-rc.15

Weakness (CWE)

CWE	Source	Description
CWE-598	cna	Use of GET Request Method With Sensitive Query Strings

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.7	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References (2)

GitHub Security Advisory (GHSA-hqm9-5xxw-4qxp) https://github.com/getgrav/grav/security/advisories/GHSA-hqm9-5xxw-4qxp
VulnCheck Advisory: Grav API Plugin - Cross-Origin Admin Account Takeover via CORS Wildcard and JWT Query Parameter https://www.vulncheck.com/advisories/grav-api-plugin-cross-origin-admin-account-takeover-via-cors-wildcard-and-jwt-query-parameter