XSS in Drupal
CVE-2017-6927
Drupal 8.4.x versions before 8.4.5 and Drupal 7.x versions before 7.57 has a Drupal.checkPlain() JavaScript function which is used to escape potentially dangerous text before outputting it to HTML (as JavaScript output does not typically go through Twig autoescaping). This function does not correctly handle all methods of injecting malicious HTML, leading to a cross-site scripting vulnerability under certain circumstances. The PHP functions which Drupal provides for HTML escaping are not affected.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.016 (74.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: -0.000
Affected products
- Drupal
- Drupal.org Drupal Core — versions 8.4.x versions before 8.4.5 and Drupal 7.x versions before 7.57
- Debian Linux — versions 7.0, 8.0, 9.0
Weakness classification (CWE)
References
- www.debian.org/security/2018/dsa-4123 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2018/02/msg00030.html (mailing-list, Mailing List, Third Party Advisory)
- www.securityfocus.com/bid/103138 (VDB Entry, Third Party Advisory, vdb-entry)
- www.drupal.org/sa-core-2018-001 (Vendor Advisory)
Frequently asked questions
- What is CVE-2017-6927?
- CVE-2017-6927 is a medium-severity vulnerability in Drupal, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-03-01.
- How severe is CVE-2017-6927?
- Medium severity. CVSS v3 base score is 6.1 out of 10.