{"id":"CVE-2026-20230","kind":"vulnerability","aliases":["CVE-2026-20230"],"related":[],"title":"A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager…","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 server-side request forgery (SSRF) attacks through an affected device.\r\n\r\nThis 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.\r\nNote: 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.\r\nNote: To exploit this vulnerability, the WebDialer service must be enabled. WebDialer is disabled by default.","summary":"A server-side request forgery flaw in Cisco Unified Communications Manager and Unified CM Session Management Edition lets an unauthenticated remote attacker make the server write files to the underlying operating system. Attackers can use those written files later to escalate to root.","severity":"critical","cvss":8.6,"epss":null,"exploited":true,"exploited_at":"2026-06-25T00:00:00+00:00","products":[{"name":"cisco unified communications manager","fixed":["14su6"],"affected":">= 14.0, < 14su6","ecosystem":"vendor"},{"name":"cisco unified communications manager","fixed":[],"affected":">= 15.0, <= 15su4a","ecosystem":"vendor"},{"name":"Cisco Unified Communications Manager","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["cisco","exploited","self-hosted","unified-cm","vendor","voice"],"not_affected_if":["no-unified-cm","unaffected-version"],"how_to_check":null,"fix":"Apply the mitigations and fixed release from Cisco's advisory, as required by CISA KEV; the sources do not name a version. Follow CISA BOD 26-04 guidance and forensic triage requirements.","status":"open","published_at":"2026-06-03T18:16:20+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:33:47+00:00","updated_at":"2026-10-24T00:09:50+00:00","category":"vendor","confidence":0.7,"triage":{"at":"2026-10-23T20:33:47Z","model":"claude-haiku-5-5","output":{"fix":"Apply the mitigations and fixed release from Cisco's advisory, as required by CISA KEV; the sources do not name a version. Follow CISA BOD 26-04 guidance and forensic triage requirements.","summary":"A server-side request forgery flaw in Cisco Unified Communications Manager and Unified CM Session Management Edition lets an unauthenticated remote attacker make the server write files to the underlying operating system. Attackers can use those written files later to escalate to root.","category":"vendor","who_cares":["cisco","unified-cm","voice","self-hosted"],"confidence":0.7,"analyst_note":"Find the Cisco advisory for CVE-2026-20230 to get affected and fixed versions, the mitigation steps, and detection guidance; the KEV entry alone does not give them.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unaffected-version","no-unified-cm"],"severity_if_unknown":"critical"},"cost_usd":0.000396,"input_tokens":2275,"output_tokens":336,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-20230':17A,20A '-2026':16A,19A 'advisori':184C 'affect':124C,152C 'allow':108C,158C 'assign':181C 'attack':65B,76B,112C,121C,139C,160C,211C 'cisco':4A,11A,21A,25A,29A,33B,51B,90C,97C,179C 'cm':9A,40B,57B,95C,105C 'communic':6A,13A,53B,92C,99C 'communications':23A,27A,31A 'conduct':114C 'could':107C,140C,157C,170C,207C 'craft':147C 'critic':191C 'cve':15A,18A 'default':231C 'devic':125C,153C 'disabl':229C 'due':129C 'edit':60B,103C 'elev':175C,212C 'enabl':226C 'escal':84B 'exploit':34B,141C,156C,203C,218C 'file':70B,81B,163C 'flaw':49B 'forgeri':48B,119C 'high':194C 'host':37B 'http':136C,148C 'impact':187C 'improp':131C 'indic':198C 'input':132C 'later':82B,173C 'let':61B 'make':66B 'manag':7A,14A,54B,59B,93C,100C,102C 'manager':24A,28A,32A 'must':224C 'note':178C,216C 'oper':74B,167C 'privileg':213C 'rate':188C 'rather':192C 'reason':200C 'remot':64B,111C 'request':47B,118C,137C,149C 'result':208C 'root':86B,177C,215C 'score':197C 'secur':183C,186C 'self':36B 'self-host':35B 'send':145C 'server':45B,68B,116C 'server-sid':44B,115C 'servic':223C 'session':58B,101C 'side':46B,117C 'sir':189C 'sme':106C 'specif':135C 'ssrf':120C 'success':155C 'system':75B,168C 'unauthent':63B,110C 'under':73B,166C 'unifi':5A,8A,12A,39B,52B,56B,91C,94C,98C,104C 'unified':22A,26A,30A 'unified-cm':38B 'use':78B,172C 'valid':133C 'vendor':41B 'voic':42B 'vulner':2A,88C,127C,143C,206C,220C 'webdial':222C,227C 'write':69B,162C 'written':80B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2026-06-03T18:16:20+00:00","kev":{"dateAdded":"2026-06-25","dueDate":"2026-06-28","requiredAction":"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.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N","cvss_by":"psirt@cisco.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2026-20230","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-20230","severity":null,"published_at":"2026-06-25T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T20:35:31+00:00","note":null},{"source":"nvd","external_id":"CVE-2026-20230","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20230","severity":null,"published_at":"2026-06-03T18:16:20+00:00","modified_at":"2026-10-07T19:17:37+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}