Vulnerability · Published Oct 27, 2026 · Assigned by VulnCheck

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

Medium 6.5

In plain English

A medium-severity resource allocation without limits in SemanticMediaWiki from SemanticMediaWiki. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 68.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
SemanticMediaWiki	SemanticMediaWiki	2.5.0 – before 7.3.1

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-vxrm-2g9f-2vqh) vendor-advisory
https://github.com/SemanticMediaWiki/SemanticMediaWiki/commit/215599f0fc03274fd4cee9ba0f7162f5a38c031b patch
VulnCheck Advisory: Semantic MediaWiki 2.5.0 before 7.3.1 Resource Exhaustion via #set_recurring_event third-party-advisory