Package Instance

silverstripe/framework BackURL validation bypass with malformed URLs
A carefully constructed malformed URL can be used to circumvent the offsite redirection protection used on `BackURL` parameters. This could lead to users entering sensitive data in malicious websites instead of the intended one.

Missing Authorization
Silverstripe Framework is the Model-View-Controller framework that powers the Silverstripe content management system. Prior to version 4.12.15, the GridField print view incorrectly validates the permission of DataObjects potentially allowing a content author to view records they are not authorised to access. Users should upgrade to Silverstripe Framework 4.12.15 or above to address the issue.

Silverstipe CMS Stored XSS in custom meta tags
A malicious content author could create a custom meta tag and execute an arbitrary JavaScript payload. This would require convincing a legitimate user to access a page and enter a custom keyboard shortcut.
This requires CMS access to exploit.

Improper Input Validation
Silverstripe Framework is the MVC framework that powers Silverstripe CMS. When a new member record is created and a password is not set, an empty encrypted password is generated. As a result, if someone is aware of the existence of a member record associated with a specific email address, they can potentially attempt to log in using that empty password. Although the default member authenticator and login form require a non-empty password, alternative authentication methods might still permit a successful login with the empty password. This issue has been patched in versions 4.13.4 and 5.0.13.

Session fixation in change password form
SilverStripe through 4.3.3 allows session fixation in the "change password" form.

Silverstripe Framework has a XSS in form messages
In some cases, form messages can contain HTML markup. This is an intentional feature, allowing links and other relevant HTML markup for the given message.

Some form messages include content that the user can provide. There are scenarios in the CMS where that content doesn't get correctly sanitised prior to being included in the form message, resulting in an XSS vulnerability.

### References

- https://www.silverstripe.org/download/security-releases/cve-2024-53277

## Reported by

Leo Diamat from [Bastion Security Group](http://www.bastionsecurity.co.nz/)

SilverStripe XXE Vulnerability in CSSContentParser
SilverStripe through 4.6.0-rc1 has an XXE Vulnerability in CSSContentParser. A developer utility meant for parsing HTML within unit tests can be vulnerable to XML External Entity (XXE) attacks. When this developer utility is misused for purposes involving external or user submitted data in custom project code, it can lead to vulnerabilities such as XSS on HTML output rendered through this custom code. This is now mitigated by disabling external entities during parsing. (The correct CVE ID year is 2020 [CVE-2020-25817, not CVE-2021-25817]).

Record titles for restricted records can be viewed if exposed by GridFieldAddExistingAutocompleter
### Impact
If a user should not be able to see a record, but that record can be added to a `GridField` using the `GridFieldAddExistingAutocompleter` component, the record's title can be accessed by that user.

**Base CVSS:** [4.3](https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C&version=3.1)
**Reported by:** Nick K - LittleMonkey, [littlemonkey.co.nz](http://littlemonkey.co.nz/)

### References
- https://www.silverstripe.org/download/security-releases/CVE-2023-48714

Silverstripe Framework has a XSS vulnerability in HTML editor
### Impact

A bad actor with access to edit content in the CMS could send a specifically crafted encoded payload to the server, which could be used to inject a JavaScript payload on the front end of the site. The payload would be sanitised on the client-side, but server-side sanitisation doesn't catch it.

The server-side sanitisation logic has been updated to sanitise against this attack.

### Reported by

James Nicoll from Fujitsu Cyber

### References

- https://www.silverstripe.org/download/security-releases/cve-2025-30148