---
id: "CVE-2026-116877"
kind: "vulnerability"
aliases: ["CVE-2026-116877"]
title: "Semantic MediaWiki: recurring-event limit bypass lets editors exhaust server resources"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["mediawiki", "package", "self-hosted", "semantic-mediawiki"]
not_affected_if: ["extension-not-installed", "trusted-editors-only"]
published_at: "2026-10-27T11:17:29+00:00"
first_seen_at: "2026-10-27T11:31:27+00:00"
updated_at: "2026-10-27T11:31:41+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116877", "first_seen_at": "2026-10-27T11:31:27+00:00"}]
---

# Semantic MediaWiki: recurring-event limit bypass lets editors exhaust server resources

Semantic MediaWiki versions 2.5.0 through 7.3.0 let a low-privilege editor bypass the smwgMaxNumRecurringEvents limit by supplying a large limit parameter. Saving a page with #set_recurring_event and no end date can generate millions of date subobjects, exhausting CPU, memory and database resources.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Semantic MediaWiki version in Special:Version or in the extension's composer.lock or extension.json; affected if it is from `2.5.0` before `7.3.1`.
- Search wiki pages for `#set_recurring_event` to see whether the parser function is in use.

## Fix

- Upgrade Semantic MediaWiki to `7.3.1` or later.

## Timeline

- 2026-10-27T11:31:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116877

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_