VulnerabilityAwaiting Analysis

CVE-2026-103438

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Wikistories extension allows Cross-Site Scripting (XSS).

LOW 0.3EPSS 0.11%

Does this matter?

Lower severity and a low EPSS score (0.11%). Track it; it rarely justifies an emergency change on its own.

Description

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Wikistories extension allows Cross-Site Scripting (XSS). This issue affects MediaWiki Wikistories extension: 1.46, 1.45, and 1.43.

CVSS 4.0: 0.3 LOWCVSS: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/M
EPSS: 0.11% probability · 1th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-80
Source: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc

EPSS trend

EPSS moved from 0.1% on 1 October 2026 to 0.1% on 26 October 2026.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.