What is CVE-2021-4271?

CVE-2021-4271 is a low-severity vulnerability in Panicsteve W2wiki, classified under CWE-707. CVSS score: 3.5/10. Published 2022-12-21.

How severe is CVE-2021-4271?

Low severity. CVSS v3 base score is 3.5 out of 10.

XSS in Panicsteve W2wiki

CVE-2021-4271

A vulnerability was found in panicsteve w2wiki. It has been rated as problematic. Affected by this issue is the function toHTML of the file index.php of the component Markdown Handler. The manipulation leads to cross site scripting. The attack may be launched remotely. The name of the patch is 8f1d0470b4ddb1c7699e3308e765c11ed29542b6. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-216476.

Published 2022-12-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (25.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 25.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Weakness classification (CWE)

References

github.com/panicsteve/w2wiki/commit/8f1d0470b4ddb1c7699e3308e765c11ed29542b6 (Patch, Third Party Advisory)
vuldb.com/ (Third Party Advisory)

Frequently asked questions

What is CVE-2021-4271?: CVE-2021-4271 is a low-severity vulnerability in Panicsteve W2wiki, classified under CWE-707. CVSS score: 3.5/10. Published 2022-12-21.
How severe is CVE-2021-4271?: Low severity. CVSS v3 base score is 3.5 out of 10.