CVE-2021-30156
MEDIUMCVSS 4.3/10EPSS 1.18%
Last modified
CVE-2021-30156 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. An issue was discovered in MediaWiki before 1.31.12 and 1.32.x through 1.35.x before 1.35.2. Special:Contributions can leak that a "hidden" user exists.. EPSS estimates a 1.18% chance of exploitation in the next 30 days.
Description
An issue was discovered in MediaWiki before 1.31.12 and 1.32.x through 1.35.x before 1.35.2. Special:Contributions can leak that a "hidden" user exists.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mediawiki | Mediawiki | < 1.31.12 |
| Mediawiki | Mediawiki | >= 1.32.0, < 1.35.2 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
References
- https://phabricator.wikimedia.org/T276306Exploit, Patch, Vendor Advisory
- https://phabricator.wikimedia.org/T276306Exploit, Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-30156?
An issue was discovered in MediaWiki before 1.31.12 and 1.32.x through 1.35.x before 1.35.2. Special:Contributions can leak that a "hidden" user exists.
How severe is CVE-2021-30156?
CVE-2021-30156 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 1.18% probability of exploitation in the next 30 days.
How do I fix CVE-2021-30156?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
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- CVE-2021-30152An issue was discovered in MediaWiki before 1.31.13 and 1.32…4.3
- CVE-2021-30153An issue was discovered in the VisualEditor extension in Med…4.3
- CVE-2021-30154An issue was discovered in MediaWiki before 1.31.12 and 1.32…6.1
- CVE-2021-30155An issue was discovered in MediaWiki before 1.31.12 and 1.32…4.3
- CVE-2021-30157An issue was discovered in MediaWiki before 1.31.12 and 1.32…6.1
- CVE-2021-30158An issue was discovered in MediaWiki before 1.31.12 and 1.32…5.3
- CVE-2021-30159An issue was discovered in MediaWiki before 1.31.12 and 1.32…4.3
- CVE-2021-30161An issue was discovered on LG mobile devices with Android OS…5.5
- CVE-2021-30162An issue was discovered on LG mobile devices with Android OS…7.1
- CVE-2021-30163Redmine before 4.0.8 and 4.1.x before 4.1.2 allows attackers…7.5
Are you affected by CVE-2021-30156?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST