CVE-2026-72529 (GCVE-0-2026-72529)
Vulnerability from cvelistv5 – Published: 2026-08-19 16:55 – Updated: 2026-08-21 03:55Summary
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.
Severity
9.8 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 00:00 UTC
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://ics-cert.kaspersky.com/advisories/2026/08… | third-party-advisory |
| https://securelist.com/tr/head-mare-targets-truec… | related |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| TrueConf | TrueConf Server |
Affected:
* , < 5.3
(custom)
Affected: 5.3 , < 5.3.9 (custom) Affected: 5.4 , < 5.4.9 (custom) Affected: 5.5 , < 5.5.5 (custom) |
guessed |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ec1bf3f1-b350-494f-9140-1560d71cc24d
Exploited: Yes
Timestamps
First Seen: 2026-08-20
Asserted: 2026-08-20
Scope
Notes: TrueConf Server Missing Authentication for Critical Function Vulnerability | Affected: TrueConf / Server | Description: TrueConf Server contains a missing authentication for critical function vulnerability which could allow a remote unauthorized attacker with network access via port 4307/TCP to execute an arbitrary script. | 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. | Due date: 2026-08-23 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://trueconf.com/blog/news/security-fixes-updates-and-advisories ; https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-72529
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-306 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Server |
| Due Date | 2026-08-23 |
| Date Added | 2026-08-20 |
| Vendorproject | TrueConf |
| Vulnerabilityname | TrueConf Server Missing Authentication for Critical Function Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-08-20 18:00 UTC
| Updated: 2026-08-20 18:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0aa97a70-a100-4c0e-8b42-70adf4b7bd9c
Exploited: Yes
Timestamps
First Seen: 2026-08-20
Asserted: 2026-08-20
Scope
Notes: 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... | Affected: TrueConf / TrueConf Server | CVSS: 9.3 (CRITICAL) | EPSS: 0.00284 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | 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... |
| Vendor | TrueConf |
| Product | TrueConf Server |
| Added Date | 2026-08-20T17:00:27.883Z |
| Cvss Score | 9.3 |
| Epss Score | 0.00284 |
| Cvss Severity | CRITICAL |
| Epss Percentile | 0.21051 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-08-21 18:00 UTC
| Updated: 2026-08-21 18:00 UTC
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"metrics": [
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"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"cvssV4_0": {
"baseScore": 9.3,
"baseSeverity": "CRITICAL",
"vectorString": "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",
"version": "4.0"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-306",
"description": "CWE-306: Missing Authentication for Critical Function",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:55:14.949Z",
"orgId": "e45d732a-8f6b-4b6b-be76-7420f6a2b988",
"shortName": "Kaspersky"
},
"references": [
{
"name": "KLCERT-26-057: TrueConf Server. Missing Authentication for Critical Function",
"tags": [
"third-party-advisory"
],
"url": "https://ics-cert.kaspersky.com/advisories/2026/08/11/trueconf-server-missing-authentication-for-critical-function/"
}
],
"solutions": [
{
"lang": "en",
"value": "Update TrueConf server to versions 5.3.9, 5.4.9 or 5.5.5."
}
],
"timeline": [
{
"lang": "en",
"time": "2026-08-03T00:00:00.000Z",
"value": "Issue discovered by Kaspersky ICS CERT and reported to TrueConf"
},
{
"lang": "en",
"time": "2026-08-04T00:00:00.000Z",
"value": "Issue confirmed by TrueConf"
},
{
"lang": "en",
"time": "2026-08-07T00:00:00.000Z",
"value": "Advisory published by Kaspersky ICS CERT"
}
],
"workarounds": [
{
"lang": "en",
"value": "Perform a full check with anti-virus software that has up-to-date anti-virus databases and software modules."
},
{
"lang": "en",
"value": "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 ics-cert@kaspersky.com for further instructions and assistance in investigating the incident."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "e45d732a-8f6b-4b6b-be76-7420f6a2b988",
"assignerShortName": "Kaspersky",
"cveId": "CVE-2026-72529",
"datePublished": "2026-08-19T16:55:14.949Z",
"dateReserved": "2026-08-10T09:55:18.375Z",
"dateUpdated": "2026-08-21T03:55:16.895Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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