critical Known exploitedREV. 01
CVE-2026-72530TrueConf Server — Isolated Environment Breakout to Host Code Execution
A code injection flaw in TrueConf Server (5.3.x up to 5.3.9, 5.4.x up to 5.4.9, 5.5.x up to 5.5.5 and earlier) lets an unauthenticated attacker who can reach port 4307 send a crafted script that escapes the server's isolated environment and runs arbitrary code on the host.
Read the risk
THE VITAL STATS- CVSS score
- 9.5/ 10 CVSS v4.0
- EPSS probability
- 2% Likelihood of exploitation
- Attack complexity
- High Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2026-08-19
- Added to KEV
- 2026-08-20
- Exploit published
- Yes
- Confidence
- high
- Kill chain
- initial access
- MITRE ATT&CK
- T1190, T1059
- Severity
- critical
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attacker needsNetwork access to TrueConf Server on port 4307; no credentials required
Behind the card
4 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Exploitsecurelist.comsecurelist.com
- 04Writeupics-cert.kaspersky.comics-cert.kaspersky.com
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-21 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-21 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-21 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-21 | claude-code | high |
| tags | nvd.nist.gov | 2026-09-21 | human | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.