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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: Stored XSS in Liferay Portal/DXP guestbook widget. ๐ **Consequences**: Attackers inject malicious scripts via **attachment filenames**.โฆ
๐ก๏ธ **Root Cause**: **CWE-79** (Cross-site Scripting). The flaw lies in improper sanitization of **file names** in the guestbook widget. User input is rendered as HTML/JS without validation, allowing script injection.
Q3Who is affected? (Versions/Components)
๐ข **Affected**: **Liferay Portal** and **Liferay DXP**. ๐ **Vendor**: Liferay (USA). Specifically, the **Guestbook Widget** component within these platforms is vulnerable.
Q4What can hackers do? (Privileges/Data)
๐ **Capabilities**: Remote attackers can execute arbitrary **Web scripts or HTML**. โ ๏ธ **Impact**: High (CVSS H). Can steal cookies, redirect users, or perform actions on behalf of authenticated users.โฆ
๐ **Threshold**: **Medium**. โ๏ธ **Auth**: Requires **Low Privileges** (PR:L). ๐ฑ๏ธ **UI**: Requires **User Interaction** (UI:R). Attackers need to trick a user into viewing the malicious file name.โฆ
๐ต๏ธ **Exploit Status**: **No Public PoC**. The `pocs` array is empty. While the vector is clear, there is no verified public exploit code or widespread wild exploitation reported yet.
Q7How to self-check? (Features/Scanning)
๐ **Self-Check**: Scan for **Liferay Portal/DXP** instances. Check if the **Guestbook Widget** is enabled. Look for uploaded attachments with suspicious characters or script tags in their **filenames**.โฆ
๐ง **Workaround**: If patching is delayed, **disable the Guestbook Widget**. Restrict file upload permissions. Implement strict **WAF rules** to block XSS payloads in file name parameters.โฆ