CVE-2021-39186 : GlobalNewFiles is a MediaWiki extension maintained by Miraheze. Prior to commit

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.

Published 2021-09-01 21:15:07

Updated 2021-09-10 19:34:21

Source GitHub, Inc.

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)Input validation

Products affected by CVE-2021-39186

Miraheze » Globalnewfiles » For Mediawiki
Versions before (<) 2021-09-01
cpe:2.3:a:miraheze:globalnewfiles:*:*:*:*:*:mediawiki:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-39186

EPSS FAQ

0.10%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 41 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-39186

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
6.1	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	2.8	2.7	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None
4.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N	2.8	1.4	GitHub, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: Low Availability: None

CWE ids for CVE-2021-39186

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-39186

https://github.com/miraheze/GlobalNewFiles/security/advisories/GHSA-57p5-hqjq-h7vg

Improper Input Validation in GlobalNewFiles · Advisory · miraheze/GlobalNewFiles · GitHub
Third Party Advisory
https://phabricator.miraheze.org/T7935

⚓ T7935 Stored XSS in GlobalNewFiles (CVE-2021-39186)
Exploit;Third Party Advisory
https://github.com/miraheze/GlobalNewFiles/commit/cee254e1b158cdb0ddbea716b1d3edc31fa4fb5d

SECURITY: Fix XSS issues GlobalNewFilesPager · miraheze/GlobalNewFiles@cee254e · GitHub
Patch;Third Party Advisory

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Vulnerability Details : CVE-2021-39186

Products affected by CVE-2021-39186

Exploit prediction scoring system (EPSS) score for CVE-2021-39186

CVSS scores for CVE-2021-39186

CWE ids for CVE-2021-39186

References for CVE-2021-39186