CVE-2026-8223

Description

A vulnerability was found in Open5GS up to 2.7.7. Affected by this vulnerability is the function pcf_sess_sbi_discover_and_send of the component sm-policies Endpoint. Performing a manipulation results in denial of service. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.

Overview

State: PUBLISHED
Assigner (CNA): VulDB
CVSS severity: MEDIUM
CVSS score: 6.9 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Effective score: 6.9 / 10 MEDIUM source: CNA overview
CWE(s): CWE-404
Reserved: 2026-05-09
Published: 2026-05-10 04:45 UTC
Last updated: 2026-05-11 17:05 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/8xxx/CVE-2026-8223.json
Linked Threat: CVE-2026-8223 — CVE-2026-8223

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-05-10 03:16:08 UTC
NVD last modified: 2026-05-13 16:10:25 UTC
NVD CVSS v3.1: 5.3 / 10 MEDIUM source: cna@vuldb.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Exploitability subscore: 3.9 / 10
Impact subscore: 1.4 / 10
EPSS score: 0.0008 (probability of exploitation in next 30 days)
EPSS percentile: 23.80% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-28958
Assigner: VulDB
Published: May 10, 2026, 2:45:08 AM
Updated: May 11, 2026, 3:05:49 PM
EUVD base score (CVSS 4.0): 6.9 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
EUVD-reported EPSS: 0.0800
Vendors: n/a
Products: Open5GS (2.7.5)

Open5GS (2.7.1)

Open5GS (2.7.2)

Open5GS (2.7.4)

Open5GS (2.7.0)

Open5GS (2.7.6)

Open5GS (2.7.7)

Open5GS (2.7.3)

ENISA description: A vulnerability was found in Open5GS up to 2.7.7. Affected by this vulnerability is the function pcf_sess_sbi_discover_and_send of the component sm-policies Endpoint. Performing a manipulation results in denial of service. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The project was informed of the problem early through an issue report but has not responded yet.

EUVD references (5)

Affected products (1)

Vendor	Product	Versions	Platforms
n/a	Open5GS	`2.7.0` (affected), `2.7.1` (affected), `2.7.2` (affected), `2.7.3` (affected), `2.7.4` (affected), `2.7.5` (affected), `2.7.6` (affected), `2.7.7` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*

Vendor references (5)

References embedded in the original CVE record by the assigning CNA.

VDB-362440 | Open5GS sm-policies Endpoint pcf_sess_sbi_discover_and_send denial of service vdb-entrytechnical-description
VDB-362440 | CTI Indicators (IOB, IOC, TTP, IOA) signaturepermissions-required
Submit #808442 | Open5gs PCF v2.7.7 Denial of Service third-party-advisory
https://github.com/open5gs/open5gs/issues/4438 exploitissue-tracking
https://github.com/open5gs/open5gs/ product

MITRE references (5) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

https://github.com/open5gs/open5gs/ product
VDB-362440 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
VDB-362440 | Open5GS sm-policies Endpoint pcf_sess_sbi_discover_and_send denial of service vdb-entry, technical-description
https://github.com/open5gs/open5gs/issues/4438 exploit, issue-tracking
Submit #808442 | Open5gs PCF v2.7.7 Denial of Service third-party-advisory

Web references (3)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

https://nvd.nist.gov/vuln/detail/CVE-2026-8223 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-8223 tenable:www.cve.org
https://www.first.org/epss/ tenable:www.first.org

NVD-tagged references (6)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/open5gs/open5gs/ cna@vuldb.com Product
https://github.com/open5gs/open5gs/issues/4438 cna@vuldb.com ExploitIssue Tracking
https://vuldb.com/submit/808442 cna@vuldb.com Third Party AdvisoryVDB Entry
https://vuldb.com/submit/808442 134c704f-9b21-4f2e-91b3-4a467353bcc0 Third Party AdvisoryVDB Entry
https://vuldb.com/vuln/362440 cna@vuldb.com Third Party AdvisoryVDB Entry
https://vuldb.com/vuln/362440/cti cna@vuldb.com Permissions RequiredVDB Entry

Remediations (14)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CISA gives agencies until Friday to patch critical cyber bug

web:federalnewsnetwork.com

CISA's latest emergency directive tells agencies to immediately patch critical vulnerabilities in Cisco networking devices.

2026-05-23 21:03 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-23 21:03 UTC
Cisco fixed maximum severity flaw CVE-2026-20223 in Secure Workload

web:securityaffairs.com

Cisco fixed a critical Secure Workload flaw ( CVE - 2026 -20223) that could let attackers gain Site Admin privileges through crafted API requests. Cisco released patches for a critical vulnerability, tracked as CVE - 2026 -20223 (CVSS score of 10.0), in Secure Workload. The flaw stems from insufficient validation and authentication in REST API endpoints. According to Cisco, remote attackers could ...

2026-05-23 21:03 UTC
Cisco Fixes CVE-2026-20223 Secure Workload API Flaw

web:thecyberexpress.com

Cisco has released security updates to fix a critical vulnerability, tracked as CVE - 2026 -20223, affecting its Cisco Secure Workload platform. The flaw, which received the maximum CVSS score of 10.0, could allow an unauthenticated remote attacker to access sensitive information and make unauthorized configuration changes through vulnerable REST ...

2026-05-23 21:03 UTC
CVE-2026-20223: Cisco Fixes Critical Secure Workload Flaw

web:www.anavem.com

Cisco Patches Critical CVE - 2026 -20223 in Secure Workload Cisco fixed a maximum-severity authentication bypass flaw in Secure Workload that grants attackers Site Admin privileges through crafted requests.

2026-05-23 21:03 UTC
A guide to vulnerability remediation vs mitigation | @Bugcrowd

web:www.bugcrowd.com

Vulnerability mitigation is typically considered a temporary or interim solution. While mitigation measures can reduce the immediate risk associated with vulnerabilities, they may not provide a permanent fix . Organizations should aim to prioritize and plan for complete vulnerability remediation whenever feasible and allocate resources accordingly.

2026-05-23 21:03 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-05-23 21:03 UTC
CVE-2026-20223 - Critical Vulnerability - TheHackerWire

web:www.thehackerwire.com

CVE - 2026 -20223 is a Critical severity vulnerability (CVSS 10). A vulnerability in the access validation of internal REST APIs of Cisco Secure Workload could allow an unauthenticated, remote attacker to...

2026-05-23 21:03 UTC
Quantifying 2026 Routinely Targeted Vulnerabilities (So Far)

web:www.vulncheck.com

VulnCheck identified 25 CVEs disclosed in 2026 that have been routinely targeted by adversaries and researchers so far this year, drawing from a global body of exploit code and exploitation data.

2026-05-23 21:03 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-23 21:03 UTC
Windows Kerberos RC4 deprecation: what will break in Active ... - 4sysops

web:4sysops.com

Starting in April 2026 , Windows updates will change the default Kerberos ticket issuance behavior to AES-SHA1 for accounts without explicit encryption settings, while RC4 can still be used where explicitly enabled. This change, driven by CVE - 2026 -20833, affects every Windows Server environment where service accounts or devices still rely on RC4. Any service account, NAS device, or legacy ...

2026-05-26 02:50 UTC
Cisco Secure Workload: Unauthenticated Access to Critical API (CVE-2026 ...

web:cibersafety.com

Cisco has issued a critical security advisory affecting Cisco Secure Workload, its policy-based network segmentation and microsegmentation platform. The vulnerability, identified as CVE - 2026 -20223, allows an unauthenticated remote attacker to access internal REST API endpoints with administrator privileges, compromising data confidentiality and the integrity of the platform's configuration.

2026-05-26 02:50 UTC
Security Advisory Bulletin 064 | Ubiquiti Community

web:community.ui.com

Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...

2026-05-26 02:50 UTC
Cisco Secure Workload Site Admin API Access Bypass (CVE-2026-20223)

web:www.thehackerwire.com

Summary CVE - 2026 -20223, published May 20, 2026 , identifies a critical (CVSS 10) access validation vulnerability in Cisco Secure Workload. This flaw allows an unauthenticated, remote attacker to bypass internal REST API authentication. A successful exploit grants the attacker Site Admin privileges, enabling them to read sensitive information and make configuration changes across tenant boundaries.

2026-05-26 02:50 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-8223.json.

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