Summary
Froxlor contains a stored cross-site scripting vulnerability that allows an authenticated customer to save malicious HTML or JavaScript in a theme value. When an administrator views the customer overview with the Theme column enabled, the script may execute in the administrator's browser and could be used to perform privileged actions.
Froxlor contains a stored cross-site scripting vulnerability that allows an authenticated customer to save malicious HTML or JavaScript in a theme value. When an administrator views the customer overview with the Theme column enabled, the script may execute in the administrator's browser and could be used to perform privileged actions.
Affected context
The issue may affect Froxlor deployments where authenticated customers can set or modify theme-related values through customer_index.php, and administrators later view those values in the customer overview. Risk increases when the Theme column is enabled and the displayed value is rendered without adequate output encoding or contextual sanitization.
The issue may affect Froxlor deployments where authenticated customers can set or modify theme-related values through customer_index.php, and administrators later view those values in the customer overview. Risk increases when the Theme column is enabled and the displayed value is rendered without adequate output encoding or contextual sanitization.
Exploit preconditions
- Attack surface: Customer-facing theme configuration handled by
customer_index.php - Required access: An authenticated customer account capable of setting the affected theme value
- Trigger point: An administrator views the customer overview with the Theme column enabled
- Why exploitation is possible: Customer-controlled content is stored and later rendered in an administrator's browser without sufficient contextual output encoding
- Privilege boundary: The attack may cross from a customer session into an administrator session through browser-executed script
- Attack surface: Customer-facing theme configuration handled by
customer_index.php - Required access: An authenticated customer account capable of setting the affected theme value
- Trigger point: An administrator views the customer overview with the Theme column enabled
- Why exploitation is possible: Customer-controlled content is stored and later rendered in an administrator's browser without sufficient contextual output encoding
- Privilege boundary: The attack may cross from a customer session into an administrator session through browser-executed script
Why this happens
The vulnerability results from storing attacker-controlled input and later inserting it into an administrative web page without applying appropriate context-sensitive output encoding or sanitization. This is a stored cross-site scripting condition mapped to CWE-79, where untrusted data is interpreted as active HTML or JavaScript by a victim's browser. If the victim has administrative privileges, the browser may send authenticated requests using the victim's session context, including CSRF-protected actions when relevant tokens are accessible to the script.
The vulnerability results from storing attacker-controlled input and later inserting it into an administrative web page without applying appropriate context-sensitive output encoding or sanitization. This is a stored cross-site scripting condition mapped to CWE-79, where untrusted data is interpreted as active HTML or JavaScript by a victim's browser. If the victim has administrative privileges, the browser may send authenticated requests using the victim's session context, including CSRF-protected actions when relevant tokens are accessible to the script.
Potential impact
- An attacker may execute JavaScript in an administrator's browser
- The vulnerability could enable unauthorized administrative actions
- An attacker may abuse an administrator's CSRF token or authenticated session context
- Administrator accounts could be created or modified
- Server settings or hosted-service configuration may be changed
- Sensitive administrative data could be exposed through browser-side actions
- An attacker may execute JavaScript in an administrator's browser
- The vulnerability could enable unauthorized administrative actions
- An attacker may abuse an administrator's CSRF token or authenticated session context
- Administrator accounts could be created or modified
- Server settings or hosted-service configuration may be changed
- Sensitive administrative data could be exposed through browser-side actions
General mitigation guidance
Mitigation generally focuses on treating all customer-controlled values as untrusted at every rendering boundary.
Common defensive patterns include:
- Applying context-appropriate output encoding when displaying theme values
- Using allowlisted theme identifiers rather than accepting arbitrary markup
- Sanitizing HTML only when rich content is explicitly required
- Enforcing server-side validation in addition to client-side controls
- Maintaining strong CSRF protections and avoiding exposure of tokens to page scripts
- Applying least privilege to customer and administrative capabilities
- Using browser security controls such as an appropriately restrictive Content Security Policy
These controls reduce the likelihood that stored input can become executable code or perform privileged actions.
Mitigation generally focuses on treating all customer-controlled values as untrusted at every rendering boundary.
Common defensive patterns include:
- Applying context-appropriate output encoding when displaying theme values
- Using allowlisted theme identifiers rather than accepting arbitrary markup
- Sanitizing HTML only when rich content is explicitly required
- Enforcing server-side validation in addition to client-side controls
- Maintaining strong CSRF protections and avoiding exposure of tokens to page scripts
- Applying least privilege to customer and administrative capabilities
- Using browser security controls such as an appropriately restrictive Content Security Policy
These controls reduce the likelihood that stored input can become executable code or perform privileged actions.
How teams detect issues like this
Organizations can identify similar risks through:
- Static analysis rules for unencoded output in templates and response-building code
- Code review checks for customer-controlled values rendered in administrative pages
- Tests that store markup and script-like input in every user-editable field
- Dynamic scanning of authenticated customer and administrator workflows
- Policy enforcement requiring contextual output encoding and allowlisted identifiers
- Monitoring for unexpected administrative actions originating from customer-managed data
Automated security review tools may help identify common stored-XSS sinks, but manual review is useful for determining rendering context and privilege boundaries.
Organizations can identify similar risks through:
- Static analysis rules for unencoded output in templates and response-building code
- Code review checks for customer-controlled values rendered in administrative pages
- Tests that store markup and script-like input in every user-editable field
- Dynamic scanning of authenticated customer and administrator workflows
- Policy enforcement requiring contextual output encoding and allowlisted identifiers
- Monitoring for unexpected administrative actions originating from customer-managed data
Automated security review tools may help identify common stored-XSS sinks, but manual review is useful for determining rendering context and privilege boundaries.
