CVE-2026-103439: the wikimedia foundation mediawiki wikbase extension
CVSS: 0.3v4.0LowAwaiting analysis
Published 30-09-2026Last modified 30-09-2026
Vulnerability summary
CVE-2026-103439 is a low (CVSS 0.3) vulnerability in the wikimedia foundation mediawiki wikbase extension. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1% of scored vulnerabilities.
CVSS score
0.3/10
010
Low · v4.0 (CVE.org)EPSS score
0.11%
0%100%
Low · Change unavailableKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 30-09-2026PublishedVulnerability first disclosed.
- 30-09-2026Last modifiedVulnerability information updated.
Description
Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Wikbase extension allows Cross-Site Scripting (XSS). This issue affects MediaWiki Wikbase extension: 1.46, 1.45, and 1.43.
CVSS metrics
2 scores · 2 sources · 1 versionLow 0.3Preferred score · CVE.org (CNA)
CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/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:AmberSourcesAll 2 agree
- NVDNIST0.3LowCVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:U/V:D/RE:M/U:Amber
EPSS trend
Probability
0.11%
Chance of exploitation in the next 30 days
Percentile
1%
Versus all other CVEs
30-day change
Change unavailable
Change unavailable
01-10-202621-10-2026
EPSS score0.11%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
The wikimedia foundation1 product
- mediawiki wikbase extension1.46 | 1.45 | 1.43
1 vendor · 1 product