Medium severity · published Jul 1, 2026
CVE-2026-58520
UrlShortener defaults to ineffective validation open to third-party redirects
6.1
CVSS
0.3%
EPSS
No
On KEV
Description
URL redirection to untrusted site ('open redirect') vulnerability in The Wikimedia Foundation Mediawiki - UrlShortener Extension allows Cross-Site Flashing.
This issue affects Mediawiki - UrlShortener Extension: from * before 1.43.9, 1.44.6, 1.45.4.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MU
Mediawiki - UrlShortener Extension · The Wikimedia Foundation
before 1.43.9, 1.44.6, 1.45.4 · source: vendor
ME
Mediawiki · Mediawiki
1.43.0 before 1.43.9; 1.44.0 before 1.44.6; 1.45.0 before 1.45.4 · source: NVD
Affected product
MU
Mediawiki - UrlShortener Extension
The Wikimedia Foundation