CVE-2026-72529
CriticalExploitedPublic exploitA 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.
Published Aug 19, 2026 · Updated Aug 21, 2026
Key Facts
Patch immediately- CVE-2026-72529 is a critical-severity vulnerability (CVSS 9.3 v4) affecting TrueConf Server.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 12, 2026. Public exploit code is available.
- EPSS estimates a 1.5% probability of exploitation in the next 30 days.
- Fixed versions are available, including TrueConf Server 5.3, TrueConf Server 5.3.9, TrueConf Server 5.4.9.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v4
9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS (30-day exploit likelihood)
1.5%
Higher than 73.2% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-72529 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Aug 20, 2026 | Aug 23, 2026 | Not reported |
| Industry KEV feed | Aug 12, 2026 | Aug 23, 2026 | Not reported |
| CIRCL KEV | Aug 20, 2026 | Aug 23, 2026 | Not reported |
| ENISA EUVD | Aug 20, 2026 | n/a | Not reported |
Required action: 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.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| TrueConf ServerTrueconf | >= 5.3 | 5.3.9.10015 |
Patched Releases
TrueConf Server
5.3, 5.3.9, 5.4.9, 5.5.5, 5.3.9.10013, 5.3.9.10015, 5.4.9.10019, 5.4.9.10072, 5.5.5.10009, 5.5.5.10010
Timeline
Added to Industry KEV feed
Aug 12, 2026
Publicly disclosed
Aug 19, 2026
Added to CISA KEV
Aug 20, 2026
Added to CIRCL KEV
Aug 20, 2026
Added to ENISA EUVD
Aug 20, 2026
Last updated
Aug 21, 2026
Weakness Type
- CWE-306 Missing Authentication for Critical Function
References
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- otherKLCERT-26-057: TrueConf Server. Missing Authentication for Critical Function
FAQ
Common Questions.
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.
Affected: TrueConf Server versions >= 5.3. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 12, 2026.
Yes. It was added on Aug 20, 2026 with a federal remediation due date of Aug 23, 2026.
Public exploit code is available.
Fixed versions are available, including TrueConf Server 5.3, TrueConf Server 5.3.9, TrueConf Server 5.4.9.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2026-72529 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo