VulnSocial

CVE-2026-34090Disclosure(mediawiki / checkuser)

LOWCVSS 7.5 · HIGH

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

mediawiki CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Patch / fix
Weakness type (CWE)
CWE-200

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • checkuser

Threat summary

  • 2 mentions across 1 observed day

What's happening

  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • 2 total mentions across 1 day

Affected systems

Vendors
mediawiki
Products
checkuser

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-05-11: 2Technical Details · 2026-05-11: 205-11
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
By indicator
Full discourse2 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-34090 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. https://www.cve.org/CVERecord?id=CVE-2026-34090 ----- Traducción: Vulnerabilidad de Exp… http://infoflow.cloud`

    Post summary

    The post announces CVE-2026-34090, outlining its impact and versions affected, but does not include PoC, exploit code, active exploitation reports, or patch information.

    0000028
    77 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-34090 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. https://www.cve.org/CVERecord?id=CVE-2026-34090

    Post summary

    The post reports the CVE-2026-34090 disclosure, detailing sensitive data exposure in the CheckUser tool of Wikimedia Foundation for versions 1.45.0 up to 1.45.2.

    00000104
    57.5K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmediawikicheckuser-mediawiki-

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