CVE-2025-1891 is a Cross-Site Request Forgery (CSRF) vulnerability identified in version 1.1 of shishuocms, a content management system. CSRF vulnerabilities allow an attacker to trick an authenticated user into submitting a forged HTTP request to the vulnerable application, causing the application to perform unwanted actions on behalf of the user without their consent. This particular vulnerability is classified as 'problematic' with a CVSS 4.0 base score of 5.3, indicating a medium severity level. The attack vector is network-based (AV:N), requiring no privileges (PR:N) and no authentication (AT:N), but it does require user interaction (UI:P), such as clicking a malicious link or visiting a crafted webpage. The vulnerability does not impact confidentiality or availability but has a limited impact on integrity (VI:L), meaning it could allow unauthorized modification of some data or state within the CMS. The vulnerability affects an unknown processing function within shishuocms 1.1, and while the exact nature of the affected functionality is unspecified, the risk is that an attacker could remotely induce state-changing actions without the user's intent. No patches or fixes are currently linked, and no known exploits are reported in the wild, but public disclosure of the exploit details increases the risk of exploitation attempts. Given the nature of CSRF, the vulnerability primarily threatens users with active sessions on the affected CMS, potentially enabling attackers to perform actions such as changing settings, modifying content, or other state-altering operations depending on the CMS's capabilities and user privileges.

For European organizations using shishuocms 1.1, this vulnerability poses a moderate risk. If exploited, attackers could manipulate CMS configurations or content without authorization, potentially leading to misinformation, defacement, or unauthorized changes that could disrupt business operations or damage reputation. Since shishuocms is a CMS, organizations relying on it for public-facing websites or internal portals could face integrity issues. The lack of impact on confidentiality and availability limits the scope of damage, but integrity compromises can still have significant operational and reputational consequences. European organizations with web-facing services using this CMS should be particularly cautious, as attackers could leverage social engineering to induce users to trigger the CSRF attack. The medium severity suggests that while urgent exploitation is less likely to cause catastrophic damage, the vulnerability should not be ignored, especially in sectors where content integrity is critical, such as government, media, education, and e-commerce.

To mitigate this vulnerability, European organizations should implement strict anti-CSRF protections in their shishuocms deployment. This includes adding CSRF tokens to all state-changing HTTP requests and validating these tokens server-side to ensure requests are legitimate. Organizations should also enforce SameSite cookie attributes to restrict cross-origin requests and consider implementing Content Security Policy (CSP) headers to reduce the risk of malicious script execution. User education is important to reduce the risk of social engineering attacks that could trick users into triggering CSRF exploits. Additionally, organizations should monitor for updates or patches from the shishuocms developers and apply them promptly once available. In the absence of official patches, organizations might consider deploying web application firewalls (WAFs) with custom rules to detect and block suspicious CSRF attack patterns. Regular security audits and penetration testing focused on CSRF and session management can help identify and remediate weaknesses. Finally, limiting user privileges within the CMS to the minimum necessary can reduce the potential impact of a successful CSRF attack.