CVE-2026-63407
HIGHDescription
Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content. Prior to 1.0.0-rc.16, the Grav API plugin CorsMiddleware returns Access-Control-Allow-Origin: * and permissive OPTIONS responses for authenticated /api/v1 endpoints. JavaScript from any origin can submit an attacker-obtained JWT through the Authorization or X-API-Token header, read the authenticated response, and perform write operations with the token owner's privileges, enabling data exfiltration and account modification. This issue is fixed in version 1.0.0-rc.16.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 19% of all known CVEs.
References
Related Vulnerabilities
Other CWE-942 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2026-22812 | High | 8.8 | 17% | - | Fix |
| CVE-2026-59726 | Critical | 10.0 | 6.9% | - | - |
| CVE-2023-38122 | High | 7.2 | 1.9% | - | Fix |
| CVE-2023-38125 | High | 8.8 | 1.3% | - | Fix |
| CVE-2026-54753 | Medium | 5.9 | 1.2% | - | - |
| CVE-2019-14860 | Medium | 6.5 | 1.2% | - | Fix |
Common questions
How do I fix CVE-2026-63407?
No published fix for CVE-2026-63407 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-63407 being actively exploited?
Not that we know of. CVE-2026-63407 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.27% is the estimated probability that it will be exploited in the next 30 days. That is higher than 19% of all scored CVEs.
How severe is CVE-2026-63407?
CVE-2026-63407 has a CVSS v3 base score of 8.2, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-25.