High severity · published Sep 29, 2026
CVE-2026-100242
DataTransfer depends on phpspreadsheet version vulnerable to CVE-2026-59933 (XLS/OLE memory exhaustion)
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
Dependency on Vulnerable Third-Party Component and Uncontrolled Resource Consumption vulnerability in Wikimedia Foundation Mediawiki - DataTransfer Extension allows Excessive Allocation.
This issue affects Mediawiki - DataTransfer Extension: from 1.46.0 before 1.47.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MD
Mediawiki - DataTransfer Extension · Wikimedia Foundation
1.46.0 before 1.47.0 · source: vendor
Affected product
MD
Mediawiki - DataTransfer Extension
Wikimedia Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100242
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100242
phabricator.wikimedia.org
https://phabricator.wikimedia.org/T433275
gerrit.wikimedia.org
https://gerrit.wikimedia.org/r/q/Ibc4a9070c2425b690bc767a882e4c35046a39be7
github.com
https://github.com/advisories/GHSA-xh5m-36r6-47m3