CVE-2021-41095 XSS via blocked watched word in error message

2021-09-2719:30:11

CWE-79

GitHub_M

www.cve.org

4.2 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

0.001 Low

EPSS

Percentile

29.3%

JSON

Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in versions 2.7.7 and earlier of the stable branch, versions 2.8.0.beta6 and earlier of the beta branch, and versions 2.8.0.beta6 and earlier of the tests-passed branch. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This vulnerability only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse’s default Content Security Policy. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. As a workaround, avoid modifying or disabling Discourse’s default Content Security Policy, and blocking watched words containing HTML tags.

CNA Affected

[
  {
    "product": "discourse",
    "vendor": "discourse",
    "versions": [
      {
        "status": "affected",
        "version": "<= 2.7.7"
      },
      {
        "status": "affected",
        "version": ">= 2.8.0.beta1, <= 2.8.0.beta6"
      }
    ]
  }
]