CVE-2025-58204 is an Open Redirect vulnerability (CWE-601) identified in the Eric Teubert Podlove Podcast Publisher software, affecting versions up to and including 4.2.5. An Open Redirect vulnerability occurs when a web application accepts a user-controlled input that specifies a URL to which the application redirects the user, without sufficient validation. This allows attackers to craft malicious URLs that appear to originate from a trusted domain but redirect victims to untrusted, potentially malicious sites. In this case, the vulnerability exists in the Podlove Podcast Publisher, a WordPress plugin widely used for managing and publishing podcast content. The vulnerability does not require authentication (PR:N) but does require user interaction (UI:R), meaning that an attacker must convince a user to click a crafted link. The CVSS 3.1 base score is 4.7 (medium severity), with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), scope changed (S:C), confidentiality impact low (C:L), and no impact on integrity or availability (I:N/A:N). The scope change (S:C) suggests that the vulnerability can affect resources beyond the vulnerable component, such as redirecting users to malicious external sites. Although no known exploits are currently reported in the wild, the vulnerability can facilitate phishing attacks by redirecting users from a trusted podcast publisher domain to malicious websites, potentially leading to credential theft, malware infection, or other social engineering attacks. The lack of a patch link indicates that a fix may not yet be publicly available or is pending release. Given the plugin's role in podcast distribution, compromised redirects could affect listeners and subscribers, undermining trust in the podcast publisher's platform.

For European organizations using the Podlove Podcast Publisher plugin, this vulnerability poses a moderate risk primarily through phishing and social engineering attacks. Attackers can exploit the open redirect to craft URLs that appear legitimate, increasing the likelihood that users will click on malicious links. This can lead to credential compromise, malware infections, or unauthorized data access if users are redirected to malicious sites designed to harvest information. Media companies, podcast producers, and content distributors in Europe relying on this plugin may experience reputational damage if their listeners are targeted via these redirects. Additionally, organizations subject to strict data protection regulations such as GDPR could face compliance issues if user data is compromised as a result of phishing attacks facilitated by this vulnerability. The impact on confidentiality is low but non-negligible, while integrity and availability remain unaffected. The requirement for user interaction limits automated exploitation but does not eliminate risk, especially in environments with large user bases or public-facing podcast content.

1. Immediate mitigation should include disabling or restricting the use of the vulnerable redirect functionality within the Podlove Podcast Publisher plugin until a patch is available. 2. Implement input validation and whitelist-based URL filtering on all redirect parameters to ensure only trusted internal URLs are allowed. 3. Educate users and podcast listeners about the risks of clicking on suspicious links, especially those purporting to come from trusted podcast sources. 4. Monitor web server logs and analytics for unusual redirect patterns or spikes in outbound traffic to untrusted domains. 5. Employ web application firewalls (WAFs) with rules designed to detect and block open redirect attempts targeting the affected plugin. 6. Once available, promptly apply vendor patches or updates addressing CVE-2025-58204. 7. For organizations managing multiple podcast sites, conduct an audit of all redirect URLs and remove or correct any that could be exploited. 8. Consider implementing multi-factor authentication (MFA) for user accounts to mitigate risks from credential theft resulting from phishing.