GHSA-3xr3-phjp-g6p2 · Severity: high · Ecosystem: composer — Drupal core access bypass vulnerability
Under some circumstances, the Drupal core JSON:API module does not properly restrict access to certain content, which may result in unintended access bypass. Sites that do not have the JSON:API module enabled are not affected.
Conclusion & alert: CVE-2020-13677 is rated Moderate Risk (51.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.05%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-07-03 | 1.04% | 1.05% | +0.02% |
| 2 | 2026-06-15 | 0.20% | 1.04% | +0.84% |
| 3 | 2026-01-15 | — | 0.20% | — |
Full EPSS history (13 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
GHSA-3xr3-phjp-g6p2 · Severity: high · Ecosystem: composer — Drupal core access bypass vulnerability
| vendor | priority | summary | link |
|---|---|---|---|
ubuntu
|
low | CVE-2020-13677 low priority: Ubuntu including 1 source packages (drupal7), 3 status rows across 3 suites (trusty, upstream, xenial): not-affected 2, needs-triage 1. | https://ubuntu.com/security/CVE-2020-13677 |
| URL | Tags |
|---|---|
| https://www.drupal.org/sa-core-2021-010 | Patch Vendor Advisory |