What’s Vulnerable › Vulnerabilities

CVE-2021-46148

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-01-10 · updated 2026-06-17
• Weakness: CWE-200

Description

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. Some unprivileged users can view confidential information (e.g., IP addresses and User-Agent headers for election traffic) on a testwiki SecurePoll instance.

Affected products

• Wikimedia Foundation MediaWiki: before 1.35.5; from 1.36.0 before 1.36.3; from 1.37.0 before 1.37.1 — fixed in 1.35.5, 1.36.3, 1.37.1

How to fix

Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.35.5, 1.36.3, 1.37.1. Check the vendor advisory for mitigations.

References

• https://gerrit.wikimedia.org/r/q/Ib2715adb281f8892b586dcb1895e87ac0eb548b0
• https://phabricator.wikimedia.org/T290808
• https://phabricator.wikimedia.org/T290856
• https://gerrit.wikimedia.org/r/q/Ib2715adb281f8892b586dcb1895e87ac0eb548b0
• https://phabricator.wikimedia.org/T290808
• https://phabricator.wikimedia.org/T290856

Get alerted when CVE-2021-46148 or the next vulnerability affects your stack