CVE-2025-9894 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Sync Feedly WordPress plugin developed by cristianr909090, specifically all versions up to and including 1.0.1. The vulnerability arises due to missing or incorrect nonce validation in the function crsf_cron_job_func, which is responsible for triggering content synchronization from Feedly. Nonces in WordPress are security tokens used to verify that requests originate from legitimate users and not from malicious third parties. The absence or improper implementation of nonce validation allows an unauthenticated attacker to craft a malicious request that, when executed by an authenticated site administrator (e.g., by clicking a link), can trigger the synchronization process without the administrator’s explicit intent. This can lead to the creation of multiple unauthorized posts on the WordPress site, potentially cluttering the site with unwanted or malicious content. The vulnerability does not allow direct data theft or site takeover but impacts the integrity of the site content by enabling unauthorized content injection. The CVSS v3.1 base score is 4.3 (medium severity), reflecting that the attack vector is network-based, requires no privileges, but does require user interaction (the administrator must be tricked into clicking a link). The vulnerability does not affect confidentiality or availability but impacts integrity. No known exploits are currently reported in the wild, and no patches have been linked yet, indicating that mitigation may require manual intervention or plugin updates once available. This vulnerability is typical of CSRF issues where insufficient request validation allows attackers to abuse authenticated user privileges indirectly.

For European organizations using WordPress sites with the Sync Feedly plugin, this vulnerability poses a moderate risk to website content integrity. Attackers could exploit this flaw to inject multiple unauthorized posts, potentially damaging the organization's reputation, confusing site visitors, or distributing misleading or malicious information. While the vulnerability does not allow direct data breaches or service disruption, the unauthorized content creation could lead to indirect impacts such as loss of user trust, SEO penalties, or increased administrative overhead to clean up injected content. Organizations in sectors with high public visibility or regulatory scrutiny (e.g., media, government, finance) may face reputational damage if exploited. Additionally, if attackers use the vulnerability to inject links or content leading to malware or phishing, it could facilitate secondary attacks against site visitors. The requirement for user interaction (administrator clicking a malicious link) somewhat limits the exploitability but does not eliminate risk, especially in environments where administrators may be targeted by phishing campaigns. Given the widespread use of WordPress in Europe and the popularity of Feedly for content aggregation, the vulnerability could affect a broad range of organizations, particularly those relying on automated content synchronization workflows.

1. Immediate mitigation should include disabling or uninstalling the Sync Feedly plugin until a patched version is released. 2. Administrators should be trained and reminded to avoid clicking on suspicious or unsolicited links, especially when logged into WordPress admin accounts. 3. Implement Web Application Firewall (WAF) rules to detect and block suspicious requests targeting the crsf_cron_job_func endpoint or unusual synchronization triggers. 4. Monitor WordPress site logs for unusual post creation patterns or unexpected synchronization events. 5. Once a patch is available, promptly update the Sync Feedly plugin to a version that correctly implements nonce validation. 6. Consider restricting administrative access to trusted IP addresses or using multi-factor authentication (MFA) to reduce the risk of compromised admin sessions. 7. Employ Content Security Policy (CSP) headers to limit the ability of malicious sites to execute unauthorized scripts or requests. 8. Regularly audit installed plugins for security updates and vulnerabilities to maintain a secure WordPress environment.