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Cisco has issued security advisories regarding two vulnerabilities in its Cisco IOx application hosting environment for Cisco IOS XE Software. The flaws, which include a stored cross-site scripting (XSS) and a carriage return line feed (CRLF) injection, target the web-based management interface.
Crucially, the Cisco Product Security Incident Response Team (PSIRT) has confirmed that a “public announcement is available for the vulnerability that is described in this advisory,” emphasizing that information about these weaknesses is already in the public domain.
Stored XSS: Administrative Access Under Threat
The first vulnerability, tracked as CVE-2026-20112 (CVSS 4.8), could allow a remote attacker to conduct a stored XSS attack against other users of the management interface.
The security advisory explains: “This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by injecting malicious code into specific pages of the interface”.
A successful exploit could allow the attacker to execute arbitrary script code or access sensitive, browser-based information within the context of the interface. This attack requires the malicious actor to already possess valid administrative credentials to inject the code.
CRLF Injection: Manipulating the Narrative
The second flaw, CVE-2026-20113 (CVSS 5.3), involves a carriage return line feed (CRLF) injection that can be triggered by an unauthenticated attacker.
Similar to the XSS flaw, this issue is caused by “insufficient validation of user input”. According to Cisco: “An attacker could exploit this vulnerability by sending crafted packets to an affected device. A successful exploit could allow the attacker to arbitrarily inject log entries, manipulate the structure of log files, or obscure legitimate log events”.
Are Your Devices Affected?
These vulnerabilities only affect Cisco devices running a vulnerable release of Cisco IOS XE Software that has been manually configured for the Cisco IOx application hosting environment. This environment is not configured by default.
To check your configuration, run the following command in privileged EXEC mode:
If the output simply shows iox, your device is currently affected.
Remediation: No Workarounds Available
Cisco has made it clear that “there are no workarounds that address this vulnerability”. Administrators must apply the official software updates released by Cisco to secure their systems.
While Cisco PSIRT is aware of the public announcement, they have stated that they are “not aware of any malicious use of the vulnerability that is described in this advisory” at the time of publication.
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