Cisco Unified Communications Manager Improper Access Control Vulnerability (CVE-2026-76487)
Published Sources: CVE.org
What is affected, what to do
A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct access control bypass attacks on an affected device. This vulnerability is due to improper input validation for specific HTTP requests.
The available sources name no fixed version. Check the vendor guidance in the references below.
- Affected
- Cisco Unified Communications Manager
eq 14..14 - Cisco Unified Communications Manager
eq 14SU1..14SU1 - Cisco Unified Communications Manager
eq 14SU2..14SU2 - Cisco Unified Communications Manager
eq 14SU3..14SU3 - Cisco Unified Communications Manager
eq 15..15 - Cisco Unified Communications Manager
eq 15SU1..15SU1 - Cisco Unified Communications Manager
eq 14SU4..14SU4 - Cisco Unified Communications Manager
eq 14SU4a..14SU4a - Cisco Unified Communications Manager
eq 15SU1a..15SU1a - Cisco Unified Communications Manager
eq 15SU2..15SU2 - Cisco Unified Communications Manager
eq 15.0.1.13010-1..15.0.1.13010-1 - Cisco Unified Communications Manager
eq 15.0.1.13011-1..15.0.1.13011-1 - Cisco Unified Communications Manager
eq 15.0.1.13012-1..15.0.1.13012-1 - Cisco Unified Communications Manager
eq 15.0.1.13013-1..15.0.1.13013-1 - Cisco Unified Communications Manager
eq 15.0.1.13014-1..15.0.1.13014-1 - Cisco Unified Communications Manager
eq 15.0.1.13015-1..15.0.1.13015-1 - Cisco Unified Communications Manager
eq 15.0.1.13016-1..15.0.1.13016-1 - Cisco Unified Communications Manager
eq 15.0.1.13017-1..15.0.1.13017-1 - Cisco Unified Communications Manager
eq 15SU3a..15SU3a - Cisco Unified Communications Manager
eq 14SU5..14SU5 - Cisco Unified Communications Manager
eq 15SU4..15SU4 - Cisco Unified Communications Manager
eq 15SU4a..15SU4a - Cisco Unified Communications Manager
eq 14SU6..14SU6
- Cisco Unified Communications Manager
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Metrics
5.3
Priority
XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.
Source: Vendor (CNA), CVSS v3
5.3
CVSS v3
Severity Medium on the scale from 0 to 10.
Source: CVE.org
—
EPSS score
No value is available for this vulnerability.
Show all metrics
- Severity
- Medium
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 56.50 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
XIEM Effective CVSS
XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.
Read in glossary- 5.3 Methodology
CVSS v3
CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.
Read in glossary- 5.3
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
CWE
CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.
Read in glossary- CWE-749
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
Description
A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct access control bypass attacks on an affected device. This vulnerability is due to improper input validation for specific HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to access parts of the network that are beyond the scope of their intended access.
Source: cvelistv5, CVE.org (MITRE)
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Cisco | Cisco Unified Communications Manager |
|
|
Weakness classes (CWE)
CWE-749Exposed Dangerous Method or Function
Base
The product provides an Applications Programming Interface (API) or similar interface for interaction with external actors, but the interface includes a dangerous method or function that is not properly restricted.
Entry at MITRE CWE-749
References & sources
- sec.cloudapps.cisco.comcisco-sa-cucm-access-PW9e8Jt2
Linked advisories
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<a href="https://intel.neosec.eu/en/cve/CVE-2026-76487"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-76487.svg?lang=en" alt="CVE-2026-76487 – NEOSEC Intel" height="20"></a>