CVE-2026-72530

Improper Control of Generation of Code

CVSS 4.0 Critical 9.5Known exploited (CISA KEV)

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Description

A remote unauthorized attacker with network access via port 4307/TCP to the TrueConf server versions 5.3.X to 5.3.9, 5.4.X to 5.4.9, 5.5.X to 5.5.5, and earlier could use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system.

Key data

CVSS 4.0 Critical 9.5

Score published by Kaspersky in the CVE record.

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: High
The attacker has to evade or get around security controls that are in place, which takes target-specific work.
Attack requirements: Present
The attack depends on certain deployment or execution conditions being present.
Privileges required: None
No account or privileges are needed.
User interaction: None
No action from any user is needed.
Vulnerable system: confidentiality: High
Serious or total effect on the secrecy of data.
Vulnerable system: integrity: High
Serious or total effect on the trustworthiness of data.
Vulnerable system: availability: High
Serious or total effect on availability.
Subsequent systems: confidentiality: High
Serious or total effect on other systems' data secrecy.
Subsequent systems: integrity: High
Serious or total effect on other systems' data trustworthiness.
Subsequent systems: availability: High
Serious or total effect on other systems' availability.

Metric	Value	What it means
Attack vector	Network	The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity	High	The attacker has to evade or get around security controls that are in place, which takes target-specific work.
Attack requirements	Present	The attack depends on certain deployment or execution conditions being present.
Privileges required	None	No account or privileges are needed.
User interaction	None	No action from any user is needed.
Vulnerable system: confidentiality	High	Serious or total effect on the secrecy of data.
Vulnerable system: integrity	High	Serious or total effect on the trustworthiness of data.
Vulnerable system: availability	High	Serious or total effect on availability.
Subsequent systems: confidentiality	High	Serious or total effect on other systems' data secrecy.
Subsequent systems: integrity	High	Serious or total effect on other systems' data trustworthiness.
Subsequent systems: availability	High	Serious or total effect on other systems' availability.

CVSS 3.1 Critical 9.0

Score published by Kaspersky in the CVE record.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: High
The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required: None
No account or privileges are needed.
User interaction: None
No action from any user is needed.
Scope: Changed
The impact can reach other components beyond the vulnerable one.
Confidentiality impact: High
Serious or total effect on the secrecy of data.
Integrity impact: High
Serious or total effect on the trustworthiness of data.
Availability impact: High
Serious or total effect on availability.

Metric	Value	What it means
Attack vector	Network	The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity	High	The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required	None	No account or privileges are needed.
User interaction	None	No action from any user is needed.
Scope	Changed	The impact can reach other components beyond the vulnerable one.
Confidentiality impact	High	Serious or total effect on the secrecy of data.
Integrity impact	High	Serious or total effect on the trustworthiness of data.
Availability impact	High	Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score: 0.01686 (1.7% probability)
Percentile: 77.2%
Scores of: Nov 10, 2026
Model: v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog: TrueConf Server Code Injection Vulnerability
Added to the catalog: Aug 20, 2026
Federal due date: Sep 3, 2026

CISA assessment as of Aug 19, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation: Recorded by CISA as active
Automatable: no
Technical impact: total

Weakness (CWE)

CWE catalog version 5.0.

CWE-94Improper Control of Generation of Code

Affected products

Products listed in the CVE record, as the CNA published them.

TrueConf Server
- affected: * up to before 5.3
- affected: 5.3 up to before 5.3.9
- affected: 5.4 up to before 5.4.9
- affected: 5.5 up to before 5.5.5

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

KLCERT-26-058: TrueConf Server. Break out of the isolated environment (ics-cert.kaspersky.com)third-party-advisory

Timeline

ID reservedAug 10, 2026
Record publishedAug 19, 2026
Added to CISA KEVAug 20, 2026
Record last updatedAug 21, 2026

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:52 UTC. Sources and licenses