CVE-2023-53955 — SOUND4 IMPACT/FIRST/PULSE/Eco v2.x Authorization Bypass via Insecure Object References

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Kantar Media WM2, Sound4 Big Voice2 Firmware, Sound4 Big Voice4 Firmware…).
2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
4. Search available logs for exploit probes matching the vulnerability class (access control), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-639 · Authorization Bypass Through User-Controlled Key (IDOR)

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.85%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Audit administrative actions and access to resources outside each user’s normal pattern.

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products added · sound4 ltd./impact/pulse/first, sound4 ltd./impact/pulse eco, sound4 ltd./bigvoice4, sound4 ltd./bigvoice2, sound4 ltd./
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 13, 2026
• CVSS changed · 9.8
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · → Analyzed
  Oct 13, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 13, 2026 · NIST National Vulnerability Database
• 2025
• CVE published
  Dec 22, 2025 · VulnCheck

Source activity

Repeated readings are counted rather than listed.

• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

4 on the record

• www.vulncheck.com/advisories/sound-impactfirstpulseeco-x-authorization-bypass-via-insec
  Third Party Advisory, third-party-advisory, NIST National Vulnerability Database
• www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5723.php
  Exploit, Third Party Advisory, third-party-advisory, NIST National Vulnerability Database
• www.exploit-db.com/exploits/51169
  Exploit, Third Party Advisory, VDB Entry, exploit, NIST National Vulnerability Database
• web.archive.org/web/20221207074555/https://www.sound4.com/
  Product, product, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• Critical CVE-2022-50796 SOUND4 IMPACT/FIRST/PULSE/Eco <=2.x Unauthenticated Remote Code Execution via upload.cgi Dec 30, 2025
• High CVE-2022-50792 SOUND4 IMPACT/FIRST/PULSE/Eco <=2.x Unauthenticated File Disclosure Vulnerability Dec 30, 2025
• High CVE-2022-50793 SOUND4 IMPACT/FIRST/PULSE/Eco <=2.x Authenticated Command Injection via www-data-handler.php Dec 30, 2025
• High CVE-2022-50795 SOUND4 IMPACT/FIRST/PULSE/Eco <=2.x Conditional Command Injection via traceroute.php Dec 30, 2025
• Critical CVE-2022-50794 SOUND4 IMPACT/FIRST/PULSE/Eco <=2.x Unauthenticated Command Injection via Username Dec 30, 2025
• High CVE-2022-50787 SOUND4 IMPACT/FIRST/PULSE/Eco <=2.x Unauthenticated Stored Cross-Site Scripting Dec 30, 2025

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No fixed version, patch or mitigation documented.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2023-53955 is "SOUND4 IMPACT/FIRST/PULSE/Eco v2.x Authorization Bypass via Insecure Object References", rated Critical. It affects WM2 (Kantar Media); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.8 describes technical severity. EPSS 0.85% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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