CVE-2026-34090

FAUCET Score

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser. This issue affects CheckUser: from 1.45.0 before 1.45.2.

First published: May 11, 2026Last modified: May 11, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
		>= 1.45.0, < 1.45.2CPE matchmatch criteria	cpe:2.3:a:mediawiki:checkuser::::::mediawiki::*

CVSS Data

CVSS version used by this source: 4.0

4.8MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/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:X/AU:X/R:U/V:X/RE:X/U:X

Attack Vector

NETWORK

Attack Complexity

LOW

Attack Requirements

NONE

Privileges Required

HIGH

User Interaction

PASSIVE

VS Confidentiality

LOW

VS Integrity

NONE

VS Availability

NONE

SS Confidentiality

NONE

SS Integrity

NONE

SS Availability

NONE

Exploit Maturity

NOT_DEFINED

CvssVersion

4.0

Exploit Intelligence

EPSS Score

0.28%

Probability of exploitation in next 30 days

EPSS Percentile

20.2%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0028 is in the 4th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

phabricator.wikimedia.org / T411366

Issue TrackingPatch