What is the CVSS score of CVE-2018-20524?

CVE-2018-20524 has a CVSS 3.0 base score of 6.1 (Medium). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.7%.

Which versions of Chat Anywhere are affected by CVE-2018-20524?

The Chat Anywhere extension 2.4.0 for Chrome allows XSS via crafted use of in a message, because a danmuWrapper DIV element in chatbox-only\danmu.js is outside the scope of a Content Security.

Is there a public PoC exploit available for CVE-2018-20524?

Yes, a public proof-of-concept exploit is available for CVE-2018-20524. Prioritise patching immediately. EPSS: 0.7%.

Chat Anywhere CVE-2018-20524

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2018-12-27 cve@mitre.org

Google XSS Chat Anywhere

6.1

CVSS 3.0 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

CVE Published

Dec 27, 2018 - 18:29 nvd

MEDIUM 6.1

DescriptionNVD

AnalysisAI

The Chat Anywhere extension 2.4.0 for Chrome allows XSS via crafted use of <<a> in a message, because a danmuWrapper DIV element in chatbox-only\danmu.js is outside the scope of a Content Security. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. The Chat Anywhere extension 2.4.0 for Chrome allows XSS via crafted use of <<a> in a message, because a danmuWrapper DIV element in chatbox-only\danmu.js is outside the scope of a Content Security Policy (CSP). Affected products include: Urlchatbox Chat Anywhere.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.