CVE WatchSep 16, 2026

CVE-2026-20234

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine (ISE) and Cisco ISE Pass

CVSS

9.9

Critical

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 16, 2026 · Last modified: Sep 16, 2026 · CWE-522

EPSS · 30d

Not enough EPSS history yet.

Technical description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) engineering teams have conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20234 are related to insufficiently protected credentials issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-522.

Official references

sec.cloudapps.cisco.comhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-ise-XU5EwX5T

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CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-922566.5 MED

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———NR255-V version 1.5.130703 contains a sensitive information disclosure vulnerability in l2tpd_config_show_cgi.c, ipsec_show_cgi.c, and mod_vpn_remote/plan.json read handlers. Attackers can query l2tpd_config_show.cgi to expose stored IPsec PSK and RSA key material.23h CVE-2026-768716.5 MED

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———Netcore NR255-V version 1.5.130703 contains a sensitive information disclosure vulnerability in mod_vpn_remote/plan.json, pptpd_user_show.cgi, pptp_client_config_show.cgi, and l2tpd_user_show.cgi. Attackers can leverage these components to obtain PPTP and L2TP VPN credentials.23h CVE-2026-768596.5 MED

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———Netcore NR255-V version 1.5.130703 contains a sensitive information disclosure vulnerability in the user_pass_show.cgi component. Low-privilege attackers can exploit this flaw via ui_config_2.xml and misc.js to disclose router credentials.23h CVE-2026-768576.5 MED

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———Netcore NR255-V version 1.5.130703 contains a sensitive information disclosure vulnerability in l7_web_auth_user_show.cgi related to captive-portal credential handling. Attackers can query this component to obtain captive-portal user credentials, compromising confidentiality of authenticated network access.23h CVE-2026-824346.5 MED

40.1%

——12Description When ZooKeeper authentication is configured, Storm deliberately retains `storm.zookeeper.topology.auth.payload` in the topology configuration, because workers need it. Nimbus then served that configuration verbatim to any caller holding read-only topology permissions, so a user whose only grant was the ability to view a topology received its ZooKeeper credential. That credential is not read-only. The cluster state implementation uses write-capable ACLs for worker heartbeats, backpressure and error state, so a recipient can forge or remove that state for the topology concerned. It is not a write credential on assignments. The same advisory covers the submission client, which logged the generated payload at INFO on every submission that generated one, and the SASL handlers, which logged it at DEBUG. The credential therefore also reached any log aggregation or support bundle collected from the cluster. Mitigation Upgrade to 3.1.0, where the payload is removed from the configuration served to read-only callers and is no longer written to logs. Users who cannot upgrade immediately should rotate `storm.zookeeper.topology.auth.payload` for existing topologies, review retained logs and support bundles for the value, and restrict read-only topology permissions to trusted principals. Credit The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.2d