What is CVE-2021-39186?

CVE-2021-39186 is a medium-severity vulnerability in Miraheze Globalnewfiles, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2021-09-01.

How severe is CVE-2021-39186?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Improper input validation in Miraheze Globalnewfiles

CVE-2021-39186

GlobalNewFiles is a MediaWiki extension maintained by Miraheze. Prior to commit number cee254e1b158cdb0ddbea716b1d3edc31fa4fb5d, the username column of the GlobalNewFiles special page is vulnerable to a stored XSS. Commit number cee254e1b158cdb0ddbea716b1d3edc31fa4fb5d contains a patch. As a workaround, one may disallow <,> (or other characters required to insert html/js) from being used in account names so an XSS is not possible.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.010 (59.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Miraheze Globalnewfiles — versions < cee254e1b158cdb0ddbea716b1d3edc31fa4fb5d

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
security-advisories@github.com (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-39186?: CVE-2021-39186 is a medium-severity vulnerability in Miraheze Globalnewfiles, classified under Improper Input Validation. CVSS score: 4.3/10. Published 2021-09-01.
How severe is CVE-2021-39186?: Medium severity. CVSS v3 base score is 4.3 out of 10.