Improper input validation in Etherpad

CVE-2018-6835

node/hooks/express/apicalls.js in Etherpad Lite before v1.6.3 mishandles JSONP, which allows remote attackers to bypass intended access restrictions.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.023 (81.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Etherpad
N/a — versions n/a

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

References

cve@mitre.org (x_refsource_CONFIRM, Third Party Advisory, Release Notes)
cve@mitre.org (x_refsource_CONFIRM, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-6835?: CVE-2018-6835 is a critical-severity vulnerability in Etherpad, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2018-02-08.
How severe is CVE-2018-6835?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-6835 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.