What is CVE-2021-31552?

CVE-2021-31552 is a medium-severity vulnerability in MediaWiki, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2021-04-22.

How severe is CVE-2021-31552?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in MediaWiki

CVE-2021-31552

An issue was discovered in the AbuseFilter extension for MediaWiki through 1.35.2. It incorrectly executed certain rules related to blocking accounts after account creation. Such rules would allow for user accounts to be created while blocking only the IP address used to create an account (and not the user account itself). Such rules could also be used by a nefarious, unprivileged user to catalog and enumerate any number of IP addresses related to these account creations.

Vulnerability class: Broken Access Control

EPSS: 0.006 (44.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Mediawiki
N/a — versions n/a

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)
cve@mitre.org (x_refsource_MISC, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2021-31552?: CVE-2021-31552 is a medium-severity vulnerability in MediaWiki, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2021-04-22.
How severe is CVE-2021-31552?: Medium severity. CVSS v3 base score is 5.4 out of 10.