How severe is CVE-2018-20524?

CVE-2018-20524 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-20524 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20524?

CVE-2018-20524 affects Urlchatbox Chat Anywhere. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20524?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-20524 published?

CVE-2018-20524 was published on 2018-12-27 and last updated on 2026-06-17.

CVE-2018-20524

CVE-2018-20524 is a medium-severity vulnerability in Urlchatbox Chat Anywhere with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Urlchatbox Chat Anywhere
Published: 2018-12-27
Last modified: 2026-06-17

Description

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).

Frequently asked questions

What is CVE-2018-20524?: 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).
How severe is CVE-2018-20524?: CVE-2018-20524 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-20524 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20524?: CVE-2018-20524 affects Urlchatbox Chat Anywhere. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20524?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20524 published?: CVE-2018-20524 was published on 2018-12-27 and last updated on 2026-06-17.

References

https://vul.su.ki/posts/Chat_Anywhere_2.4.0_XSS.md/

Affected products (1)

cpe:2.3:a:urlchatbox:chat_anywhere:2.4.0:*:*:*:*:chrome:*:*

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