CVE-2026-58656
Grav API plugin accepts JWT via ?token enabling authenticated cross-origin access
Is CVE-2026-58656 being exploited?
Not confirmed. CVE-2026-58656 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.45% probability of exploitation in the next 30 days.
How severe is CVE-2026-58656?
CVE-2026-58656 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-58656?
Yes. A fix has been recorded for CVE-2026-58656. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58656 affect?
CVE-2026-58656 affects Grav CMS API plugin (versions before v1.0.0-rc.16), Websites using Grav with the API plugin enabled. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-58656?
Update to v1.0.0-rc.16+, revoke/rotate exposed JWTs and admin creds, audit logs, restrict CORS.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Leaked JWTs permit authenticated cross-origin requests to create super-admin backdoors and exfiltrate configs and user data.
Immediate action required
- affected<= 1.0.0-rc.15
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.