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, and 5.3.X before 5.3.9, 5.4.X before 5.4.9, or 5.5.X before 5.5.5. 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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 the affected 5.3, 5.4, and 5.5 release lines and earlier, is vulnerable. A remote attacker who can reach the server over the network on TCP port 4307 without authentication could run arbitrary scripts on the system by calling an undocumented function.
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 execute an arbitrary script by calling an undocumented function.
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-2026-72529
What does this mean?
A remote attacker with network access to TCP port 4307 on a TrueConf server, and no login, can make the server run arbitrary scripts.Source: ics-cert.kaspersky.com
Am I affected, and how do I check?
TrueConf Server for Windows or Linux before 5.3, and 5.3.X before 5.3.9, 5.4.X before 5.4.9, or 5.5.X before 5.5.5. Check the installed TrueConf Server version against these ranges, and check whether TCP port 4307 is reachable over 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, matching the release branch in use.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