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 t
Affects TrueConf Server for Windows or Linux before 5.3.9, 5.4.9 and 5.5.5, and all versions before 5.3, when TCP port 4307 is reachable over the network. Fixed in 5.3.9, 5.4.9 and 5.5.5.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 5.3, 5.3.9, 5.4.9, 5.5.5
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The TrueConf Server video conferencing software, in multiple affected release lines, is vulnerable when its network port is reachable. A remote attacker without credentials could use a specially crafted script to escape the software's isolated environment and run arbitrary code on the underlying host system.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original 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.
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- Record last updated
- CISA remediation deadline
Due date for US federal agencies to patch
Affected versions
- TrueConf TrueConf Server
From * · fixed in 5.3; From 5.3 · fixed in 5.3.9; From 5.4 · fixed in 5.4.9; From 5.5 · fixed in 5.5.5
References 1
ics-cert.kaspersky.com
Questions about CVE-2026-72530
What does this mean?
A remote attacker with network access to TCP port 4307 on the TrueConf server can break out of the isolated environment and execute arbitrary code on the host system.Source: ics-cert.kaspersky.com
Am I affected, and how do I check?
TrueConf Server for Windows or Linux in versions 5.3.X before 5.3.9, 5.4.X before 5.4.9, 5.5.X before 5.5.5, and any version before 5.3. To check a server, compare its installed TrueConf Server version with these ranges and check whether TCP port 4307 is reachable from the network.Source: ics-cert.kaspersky.com
What should I do about it?
Update TrueConf Server to 5.3.9, 5.4.9 or 5.5.5, whichever matches the installed release line.Source: ics-cert.kaspersky.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-08-20, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data