Is CVE-2026-103440 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-103440 being exploited in the wild.

How severe is CVE-2026-103440?

Informational severity, published 30 September 2026.

Which products and versions are affected?

Wikimedia MediaWiki PageTriage extension 1.43, 1.45, 1.46.

Is there a fix for CVE-2026-103440?

A patch was published on 2026-08-31. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-103440 attacked?

It is attacked over the network.

Am I affected by CVE-2026-103440?

Check whether you run Wikimedia MediaWiki PageTriage extension at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-103440: Wikimedia MediaWiki PageTriage information disclosure in API

CVE-2026-103440 · Severity: info · Published 2026-09-30

The MediaWiki PageTriage extension's public API endpoint fails to redact suppressed (hidden) reviewer usernames and profile links when returning page review metadata. An unauthenticated attacker can query the pagetriagelist API to recover the identities of suppressed accounts, bypassing MediaWiki's privacy protections that hide controversial or at-risk editor accounts. This affects wiki administrators using PageTriage to manage page reviews, exposing sensitive account information that should remain confidential.

Vendors: Wikimedia.

Quick answers

Is CVE-2026-103440 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-103440 being exploited in the wild.
How severe is CVE-2026-103440?: Informational severity, published 30 September 2026.
Which products and versions are affected?: Wikimedia MediaWiki PageTriage extension 1.43, 1.45, 1.46.
Is there a fix for CVE-2026-103440?: A patch was published on 2026-08-31. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-103440 attacked?: It is attacked over the network.
Am I affected by CVE-2026-103440?: Check whether you run Wikimedia MediaWiki PageTriage extension at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The ApiPageTriageList component correctly checks User::isHidden() for page creators and redacts their names, but fails to perform the same check for reviewer names, which are directly serialized from the ptrp_last_reviewed_by database field without hidden-status validation. The vulnerability is a CWE-200 information exposure in a public, unauthenticated API query requiring no user interaction—only knowledge of a page ID. Patches add proper hidden-status checks for reviewer fields before serialization.

Affected products

Wikimedia MediaWiki PageTriage extension 1.43, 1.45, 1.46

Timeline

2026-09-30: disclosed
2026-08-31: patched

References

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