--- title: "CVE-2026-72530: Improper Control of Generation of Code | CubePath" 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…" language: en source: https://cubepath.com/security/cve/CVE-2026-72530 --- # CVE-2026-72530: Improper Control of Generation of Code | CubePath ## 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. Official description from the CVE record, published by Kaspersky. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-72530) ## 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 | 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 | 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](https://www.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 names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-94](https://cwe.mitre.org/data/definitions/94.html) Improper 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](https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isolated-environment/) (ics-cert.kaspersky.com) third-party-advisory ## Timeline 1. ID reserved Aug 10, 2026 2. Record published Aug 19, 2026 3. Added to CISA KEV Aug 20, 2026 4. Record last updated Aug 21, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) 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, 19:10 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)