CVE-2026-72530: TrueConf Server Code Injection Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 1 day after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 1.7%
EPSS score, percentile 76.9 of all scored records
- How severe?
- 9.5 Critical
CVSS v4.0 base score, given by the CNA
- What should I do?
CISA deadline . Apply mitigations in accordance with vendor instructions … Full text
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- from * to before 5.3
- from 5.3 to before 5.3.9
- from 5.4 to before 5.4.9
- from 5.5 to before 5.5.5
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
What to do
Required action, set by CISA
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA due date for this action: .
Solution (from the CVE record)
Update TrueConf server to versions 5.3.9, 5.4.9 or 5.5.5.
Workaround (from the CVE record)
Perform a full check with anti-virus software that has up-to-date anti-virus databases and software modules.
Conduct a scan for indicators of compromise. In the event of detecting indicators of compromise, change passwords for accounts that may have been compromised and contact Kaspersky ICS CERT at [email protected] for further instructions and assistance in investigating the incident.
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
- https://trueconf.com/blog/news/security-fixes-updates-and-advisories
- https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-breakout-from-isolated-environment/
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-72530
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from * to before 5.3 |
| Affected | from 5.3 to before 5.3.9 |
| Affected | from 5.4 to before 5.4.9 |
| Affected | from 5.5 to before 5.5.5 |
Versions not listed are: unaffected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
About this vulnerability
TrueConf Server contains a code injection vulnerability that could allow an unauthorized remote attacker with network access via port 4307/TCP to use a specially crafted script to break out of the isolated environment and execute arbitrary code on the host system.
Summary: CISA's KEV catalog, as of .
- CISA added CVE-2026-72530 to its Known Exploited Vulnerabilities (KEV) catalog on 20 Aug 2026.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 3 Sep 2026.
- The CVE record was published on 19 Aug 2026, 1 day before it was added to KEV.
- The CVE record carries a CVSS v4.0 base score of 9.5 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 1.7% (percentile 76.9), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
Weakness
- CWE-94: Code Injection
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| Added to CISA KEV | |
| CVE record last updated | |
| CISA due date for the required action |
References
More exploited TrueConf vulnerabilities
- CVE-2026-72529: TrueConf Server Missing Authentication for Critical Function Vulnerability
- CVE-2026-3502: TrueConf Client Download of Code Without Integrity Check Vulnerability