MediaWiki ReportIncident Extension Flaw Exposes Wikimedia to DoS Attacks
CVE Notify is flagging a critical vulnerability, CVE-2026-5762, impacting the Wikimedia Foundation’s MediaWiki platform. Specifically, the ReportIncident Extension suffers from an allocation of resources without limits or throttling, which could be exploited to launch HTTP Denial of Service (DoS) attacks. This means an attacker could potentially overwhelm the server by making excessive requests, rendering services unavailable to legitimate users.
According to CVE Notify, the vulnerability has only been patched on the master branch. This leaves systems not actively tracking or applying updates from this specific branch exposed. The implications are significant given MediaWiki’s widespread use for hosting large-scale wikis, including Wikipedia itself. A successful DoS attack could disrupt information access and damage the reputation of affected organizations.
What This Means For You
- Organizations using MediaWiki should verify if they are running the ReportIncident Extension and immediately check if their deployment is running a version derived from the `master` branch or has applied the fix referenced in the Gerrit commit; otherwise, prioritize updating to a remediated version to prevent potential DoS attacks.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rule · 6 SIEM formats1 detection rule mapped to MITRE ATT&CK. Free Sigma YAML below.
DoS Traffic Pattern Detection
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-5762 | DoS | Wikimedia Foundation MediaWiki - ReportIncident Extension, allocation of resources without limits or throttling vulnerability, HTTP DoS |
Related coverage
Daily Security Digest — 2026-05-22
13 vulnerability disclosures (5 Critical, 8 High) and 14 curated intelligence stories from 6 sources.
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