CVE-2018-11101: n/a vulnerability

CVE-2018-11101: Open Whisper Signal (aka Signal-Desktop) through 1.10.1 allows XSS via a resource location specified in an...

Open Whisper Signal (aka Signal-Desktop) through 1.10.1 allows XSS via a resource location specified in an attribute of a SCRIPT, IFRAME, or IMG element, leading to JavaScript execution after a reply, a different vulnerability than CVE-2018-10994. The attacker needs to send HTML code directly as a message, and then reply to that message to trigger this vulnerability. The Signal-Desktop software fails to sanitize specific HTML elements that can be used to inject HTML code into remote chat windows when replying to an HTML message. Specifically the IMG and IFRAME elements can be used to include remote or local resources. For example, the use of an IFRAME element enables full code execution, allowing an attacker to download/upload files, information, etc. The SCRIPT element was also found to be injectable. On the Windows operating system, the CSP fails to prevent remote inclusion of resources via the SMB protocol. In this case, remote execution of JavaScript can be achieved by referencing the script on an SMB share within an IFRAME element, for example: <IFRAME src=\\DESKTOP-XXXXX\Temp\test.html> and then replying to it. The included JavaScript code is then executed automatically, without any interaction needed from the user. The vulnerability can be triggered in the Signal-Desktop client by sending a specially crafted message and then replying to it with any text or content in the reply (it doesn't matter).

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 07:54 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2018-11101 affects old Signal Desktop versions through 1.10.1. A malicious message containing HTML could execute JavaScript in a remote chat window after the recipient replied. The bundle does not show active exploitation or a named fixed version, but the described impact includes file and information access from the desktop client context. Exposure is most likely limited to legacy Signal Desktop deployments running version 1.10.1 or earlier. Modern or auto-updated clients may not be affected, but the source bundle does not provide fixed-version confirmation. Treat as high priority only where legacy Signal Desktop remains in use. The business risk is user-context code execution from chat content, but urgency depends on finding affected desktop clients because the vulnerability is old and not KEV-listed. Mitigation focus: Inventory Signal Desktop versions and flag 1.10.1 or earlier.; Check Signal or vendor release guidance for fixed builds.; Update or retire affected legacy desktop clients..

Prepared: Jun 7, 2026, 13:21 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 17, 2018, 19:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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