What is CVE-2021-26636?

CVE-2021-26636 is a high-severity vulnerability in Linux Kernel, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2022-06-23.

How severe is CVE-2021-26636?

High severity. CVSS v3 base score is 8.8 out of 10.

XSS in Linux Kernel

CVE-2021-26636

Stored XSS and SQL injection vulnerability in MaxBoard could lead to occur Remote Code Execution, which could lead to information exposure and privilege escalation.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-06-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.1th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.015 · change: +0.000

Affected products

Linux Kernel
Maxb Maxboard
Maxboard — versions unspecified

Weakness classification (CWE)

References

www.krcert.or.kr/krcert/secNoticeView.do (Third Party Advisory)

Frequently asked questions

What is CVE-2021-26636?: CVE-2021-26636 is a high-severity vulnerability in Linux Kernel, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2022-06-23.
How severe is CVE-2021-26636?: High severity. CVSS v3 base score is 8.8 out of 10.