What is CVE-2021-32855?

CVE-2021-32855 is a medium-severity vulnerability in B3log Vditor, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-02-21.

How severe is CVE-2021-32855?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in B3log Vditor

CVE-2021-32855

Vditor is a browser-side Markdown editor. Versions prior to 3.8.7 are vulnerable to copy-paste cross-site scripting (XSS). For this particular type of XSS, the victim needs to be fooled into copying a malicious payload into the text editor. Version 3.8.7 contains a patch for this issue.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-02-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

B3log Vditor
Npm Vditor — versions 3.8.7

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

securitylab.github.com/advisories/GHSL-2021-1006-vditor/ (Exploit, Third Party Advisory)
github.com/Vanessa219/vditor/issues/1085 (Third Party Advisory, Issue Tracking)
github.com/Vanessa219/vditor/commit/1b2382d7f8a4ee509d9245db4450d926a0b24146 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-32855?: CVE-2021-32855 is a medium-severity vulnerability in B3log Vditor, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-02-21.
How severe is CVE-2021-32855?: Medium severity. CVSS v3 base score is 6.1 out of 10.