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Vulnerability · Published Sep 30, 2026 · Assigned by wikimedia-foundation

CVE-2026-103443API permits session-seeded javascript URL XSS

Low 1.1

In plain English

A low-severity security flaw in MediaWiki Collection (Book) extension from The Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 4.0)1.1Low
Exploit odds (30 days)0.2%top 90.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Collection (Book) extension allows XSS Targeting Non-Script Elements. This issue affects MediaWiki Collection (Book) extension: 1.46, 1.45, and 1.43.

Affected products (as reported)

VendorProductVersions
The Wikimedia Foundation MediaWiki Collection (Book) extension 1.461.451.43

Weakness: CWE-80 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/S:N/AU:Y/R:U/V:D/RE:M/U:Amber

References