# CVE-2026-74793 — EmilStenstrom justhtml

> As of 2026-08-23, CVE-2026-74793 is a MEDIUM-severity vulnerability in EmilStenstrom justhtml, CVSS v3.1 6.1, EPSS 0.2% (10.2th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-74793 as of 2026-08-23; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-23

## What is CVE-2026-74793?

justhtml before 3.11.0 contains a cross-site scripting vulnerability where the default sanitizer bypasses event handler removal in selectedcontent projections. Attackers can inject SVG or MathML elements with event handlers that are cloned and reinserted into output without sanitization, enabling stored or reflected XSS attacks.

The record classifies CVE-2026-74793 under weakness class [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 43 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.1 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **CVSS v4.0 base score:** 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 10.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-23

## Is CVE-2026-74793 being exploited?

It currently carries a trending score of 32 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [EmilStenstrom](https://intel.threadlinqs.com/vendors/emilstenstrom): justhtml

## How to fix CVE-2026-74793

No vendor patch reference has been recorded for CVE-2026-74793 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-74793

No threat campaign in the Threadlinqs corpus currently references CVE-2026-74793, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-24.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/EmilStenstrom/justhtml/security/advisories/GHSA-gjf2-f4jc-69xf)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/justhtml-before-xss-via-selectedcontent-projection)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-74793
Full detection coverage and IOCs for threats exploiting CVE-2026-74793 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp