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Not in CISA KEV
HIGH severity

CVE-2017-6377 — core

HIGH

CVE-2017-6377 is a high-severity (CVSS 7.5) CWE-863 vulnerability in drupal/core. A fix is available for drupal/core — see the affected versions and patch details below.

Drupal editor module incorrectly checks access to inline private files

Also known asGHSA-w7qx-vwr9-2j3r
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Oct 26, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk
0.00%0.80%1.59%2.39%0.3%1.9%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
🐘drupal/core🐘drupal/drupal

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

When adding a private file via the editor in Drupal 8.2.x before 8.2.7, the editor will not correctly check access for the file being attached, resulting in an access bypass.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistdrupal/core≥ 8.2.0&&< 8.2.78.2.7composer require drupal/core:^8.2.7
🐘Packagistdrupal/drupal≥ 8.2.0&&< 8.2.78.2.7composer require drupal/drupal:^8.2.7

Affected Products

1 product · 12 configurations
Application
drupaldrupal
7 versions
8.2.08.2.18.2.28.2.38.2.48.2.58.2.6

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for drupal/core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update drupal/core to 8.2.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-6377 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

When adding a private file via the editor in Drupal 8.2.x before 8.2.7, the editor will not correctly check access for the file being attached, resulting in an access bypass.
O3 Security · Impact-Aware SCA

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CVE-2017-6377: core — Fixed in 8.2.7