CVE-2026-0671 | Multiple stored i18n/message-key XSSes in UploadWizard

Exp

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki - UploadWizard extension allows Cross-Site Scripting (XSS).This issue affects MediaWiki - UploadWizard extension: 1.45, 1.44, 1.43, 1.39.

Published: 2026-01-08 Last update: 2026-06-17 Assigner: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc Source: c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-0671 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.20%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2026-0671

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2026-0671

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.03% 0.20% +0.17%
2 2026-06-06 0.07% 0.03% -0.03%
3 2026-05-10 — 0.07% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-0671

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-0671

Affected software / configurations for CVE-2026-0671

Vendor Product Version Raw CPE
wikimedia mediawiki-extensions-uploadwizard 1.39 cpe:2.3:a:wikimedia:mediawiki-extensions-uploadwizard:1.39:*:*:*:*:*:*:*
wikimedia mediawiki-extensions-uploadwizard 1.43 cpe:2.3:a:wikimedia:mediawiki-extensions-uploadwizard:1.43:*:*:*:*:*:*:*
wikimedia mediawiki-extensions-uploadwizard 1.44 cpe:2.3:a:wikimedia:mediawiki-extensions-uploadwizard:1.44:*:*:*:*:*:*:*
wikimedia mediawiki-extensions-uploadwizard 1.45 cpe:2.3:a:wikimedia:mediawiki-extensions-uploadwizard:1.45:*:*:*:*:*:*:*

References for CVE-2026-0671

cvelogic Threat Intelligence