8.6 CVE-2026-20230

Enriched by CISA
 

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 server-side request forgery (SSRF) attacks through 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 write files to the underlying operating system that could be used later to elevate to root. Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root. Note: To exploit this vulnerability, the WebDialer service must be enabled. WebDialer is disabled by default.
https://nvd.nist.gov/vuln/detail/CVE-2026-20230

Categories

CWE-918 : Server-Side Request Forgery (SSRF)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Cross Site Port Attack Server-Side Request Forgery Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.) SSRF in LLM toolkit accesses arbitrary URLs for images, as exploited in the wild in April 2026 to conduct port scanning [REF-1519] SSRF in LLM application development framework because the URL retriever allows connections to local addresses using a crafted Location header Chain: LLM integration framework has prompt injection(CWE-1427) that allows an attacker to force the service to retrievedata from an arbitrary URL, essentially providing SSRF (CWE-918) andpotentially injecting content into downstream tasks. Server Side Request Forgery (SSRF) in mail server, as exploited in the wild per CISA KEV. Server Side Request Forgery in cloud platform, as exploited in the wild per CISA KEV. Chain: incorrect validation of intended decimal-based IP address format (CWE-1286) enables parsing of octal or hexadecimal formats (CWE-1389), allowing bypass of an SSRF protection mechanism (CWE-918). Web server allows attackers to request a URL from another server, including other ports, which allows proxied scanning. CGI script accepts and retrieves incoming URLs. Web-based mail program allows internal network scanning using a modified POP3 port number. URL-downloading library automatically follows redirects to file:// and scp:// URLs

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Cisco Cisco Unified Communications Manager
  • N/A [affected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end

REMEDIATION


EXPLOITS

Exploit-db.com

id description date
No known exploits

POC Github

Url
No known exploits

Other Nist (github, ...)

Url
No known exploits

CAPEC

Common Attack Pattern Enumerations and Classifications

id description severity
664 Server Side Request Forgery
High