CVE-2026-62387 Grav < 1.0.0-rc.16 CORS Misconfiguration via API Plugin
Attackers with valid tokens can perform cross-origin read and write operations due to insecure default CORS settings in the Grav API plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-62387?
CVE-2026-62387 is a high-severity vulnerability in getgrav grav, published on 17 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The Grav API plugin (getgrav/grav-plugin-api) before 1.0.0-rc.16 shipped Access-Control-Allow-Origin: * as its default CORS configuration on all responses, including authenticated endpoints and preflight (OPTIONS) responses. Because the plugin accepts credentials via the Authorization and X-API-Token headers (set programmatically by JavaScript rather than via cookies), an attacker who obtains a valid access token (e.g., via log leakage, Referer headers, browser history, or network capture) can issue fully authenticated cross-origin requests from any malicious website to read sensitive data and perform write operations as the token's user. Fixed in 1.0.0-rc.16.
Weakness: CWE-942
Which versions are affected by CVE-2026-62387?
How do I fix CVE-2026-62387?
No fix has been published for CVE-2026-62387 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-62387 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-62387 exists.
Sources
Also known as GHSA-h4x5-fmw9-97f9.