CVE-2026-116877 Semantic MediaWiki 2.5.0 before 7.3.1 Resource Exhaustion via #set_recurring_event

High 8.7 Published 27 Oct 2026 Updated 27 Oct 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-116877?

CVE-2026-116877 is a high-severity vulnerability in SemanticMediaWiki, published on 27 Oct 2026.

Official description

Semantic MediaWiki from 2.5.0 before 7.3.1 contains an uncontrolled resource consumption vulnerability that allows low-privilege editors to bypass smwgMaxNumRecurringEvents by supplying a large limit parameter. Attackers can save pages using #set_recurring_event without an end date to generate thousands or millions of date subobjects, exhausting CPU, memory, and database resources.

Weakness: CWE-770

Which versions are affected by CVE-2026-116877?

How do I fix CVE-2026-116877?

No fix has been published for CVE-2026-116877 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-116877 being exploited?

There is no known exploitation of CVE-2026-116877 in the wild and no public exploit code.

Sources

Also known as GHSA-2472-xm32-fr75, GHSA-vxrm-2g9f-2vqh.