CVE-2021-32764CWE-79

YouTube Onebox susceptible to XSS

High · published July 15, 2021

CVSS v3.1
8.1
EPSS
1%
Percentile
44.9
In the wild
Unconfirmed
What it is

Discourse is an open-source discussion platform. In Discourse versions 2.7.5 and prior, parsing and rendering of YouTube Oneboxes can be susceptible to XSS attacks. This vulnerability only affects sites which have modified or disabled Discourse's default Content Security Policy. The issue is patched in `stable` version 2.7.6, `beta` version 2.8.0.beta3, and `tests-passed` version 2.8.0.beta3. As a workaround, ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00545 · 44.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2021-07-15T20:40Z
EPSS history
Timeline
  • 15 JUL 20:40Z
    YouTube Onebox susceptible to XSS
    cvelistv5