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

Critical 9.3 Published 22 Dec 2025 Updated 1 Oct 2026

Attackers can bypass authorization to access hidden resources and execute privileged functions in SOUND4 broadcast automation systems.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-53955?

CVE-2023-53955 is a critical authentication bypass vulnerability in Kantar Media BigVoice2, published on 22 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

SOUND4 IMPACT/FIRST/PULSE/Eco v2.x contains an insecure direct object reference vulnerability that allows attackers to bypass authorization and access hidden system resources. Attackers can exploit the vulnerability by manipulating user-supplied input to execute privileged functionalities without proper authentication.

Weakness: CWE-639

Which versions are affected by CVE-2023-53955?

It affects 9 products.

Products include Sound4 Big Voice2 Firmware, Sound4 Big Voice4 Firmware, Sound4 First Firmware, Sound4 Impact Eco Firmware, Sound4 Impact Firmware, Sound4 Pulse Eco Firmware and 3 more.

How do I fix CVE-2023-53955?

No fix has been published for CVE-2023-53955 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2023-53955 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-53955 exists.

Sources

Also known as GHSA-gj7r-228j-689h.