How severe is CVE-2026-34092?

CVE-2026-34092 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-34092 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34092?

CVE-2026-34092 affects Mediawiki. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34092?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34092 have an EU (EUVD) identifier?

Yes. CVE-2026-34092 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29064.

When was CVE-2026-34092 published?

CVE-2026-34092 was published on 2026-05-11 and last updated on 2026-06-17.

CVE-2026-34092

CVE-2026-34092 is a high-severity vulnerability in Mediawiki with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 2.1
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29064
Weakness: CWE-200
Affected product: Mediawiki
Published: 2026-05-11
Last modified: 2026-06-17

Description

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Skin/Skin.Php. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

Frequently asked questions

What is CVE-2026-34092?: Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Skin/Skin.Php. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.
How severe is CVE-2026-34092?: CVE-2026-34092 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-34092 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34092?: CVE-2026-34092 affects Mediawiki. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34092?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34092 have an EU (EUVD) identifier?: Yes. CVE-2026-34092 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29064.
When was CVE-2026-34092 published?: CVE-2026-34092 was published on 2026-05-11 and last updated on 2026-06-17.

References

https://phabricator.wikimedia.org/T384147

Affected products (1)

cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*

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