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CVE-2026-71502
5.1 MEDIUM
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CVSS version (CVSS): 4.0
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Attack Vector (AV): Network (N)
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Attack Complexity (AC): Low (L)
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Attack Requirement (AT): None (N)
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Privileges Required (PR): None (N)
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User Interaction (UI): Active (A)
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Vulnerable System Impact Confidentiality (VC): Low (L)
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Vulnerable System Impact Integrity (VI): Low (L)
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Vulnerable System Impact Availability (VA): None (N)
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Subsequent System Impact Confidentiality (SC): Low (L)
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Subsequent System Impact Integrity (SI): Low (L)
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Subsequent System Impact Availability (SA): None (N)
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Modified Attack Vector (MAV): Network (N)
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Modified Attack Complexity (MAC): Low (L)
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Modified Attack Requirement (MAT): None (N)
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Modified Privileges Required (MPR): None (N)
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Modified User Interaction (MUI): Active (A)
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Modified Vulnerable System Impact Confidentiality (MVC): Low (L)
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Modified Vulnerable System Impact Integrity (MVI): Low (L)
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Modified Vulnerable System Impact Availability (MVA): None (N)
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Modified Subsequent System Impact Confidentiality (MSC): Low (L)
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Modified Subsequent System Impact Integrity (MSI): Low (L)
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Modified Subsequent System Impact Availability (MSA): Negligible (N)
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Safety (S): Not Defined (X)
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Automatable (AU): Not Defined (X)
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Recovery (R): Not Defined (X)
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Value Density (V): Not Defined (X)
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Vulnerability Response Effort (RE): Not Defined (X)
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Provider Urgency (U): Not Defined (X)
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Confidentiality Req. (CR): Not Defined (X)
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Integrity Req. (IR): Not Defined (X)
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Availability Req. (AR): Not Defined (X)
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Exploit Maturity (E): Not Defined (X)
created
1 month ago
Activity log
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Created & dismissed (no matching packages found) suggestion
1 month ago
Unauthenticated Stored Vue Template Injection Leads to Cross-Site Scripting in CTI-Transmute
CTI-Transmute contains a stored cross-site scripting vulnerability caused by insufficient neutralization of Vue template expression delimiters in server-rendered user-controlled data.
An unauthenticated attacker can create a public conversion whose name or description contains a malicious Vue expression using the application's configured [[ ... ]] delimiters. User profile names may provide an additional injection vector. Although Jinja HTML escaping is applied, the resulting value is subsequently included in a DOM region compiled by Vue.
Vue interprets the attacker-controlled value as a template expression rather than ordinary text. By accessing the JavaScript Function constructor from within the expression, an attacker can execute arbitrary JavaScript in the security context of the CTI-Transmute origin. The application's nonce-based Content Security Policy does not prevent exploitation because the Vue runtime compiler requires the unsafe-eval policy exception.
The malicious payload is stored by the application and executed whenever another user opens an affected page, such as the public conversion detail page. The victim may be a normal user or an administrator. Successful exploitation could allow the attacker to:
* Access data available to the victim through the application.
* Extract API keys, tokens, or other sensitive information exposed to the page.
* Perform authenticated actions using the victim's session.
* Modify conversions or other application data.
* Escalate the impact by targeting an administrator.
A demonstrated payload can use [].constructor.constructor(...) to obtain the JavaScript Function constructor and execute arbitrary code. The regression tests also show that a short first-stage payload could retrieve an uncapped conversion description and evaluate a larger second-stage payload.
The patch addresses the vulnerability by registering a global Jinja finalize hook that inserts a zero-width Unicode word joiner inside every Vue delimiter found in server-rendered values. This prevents Vue from recognizing the values as template expressions while preserving their visible representation.