CVE-2025-52277 is a Cross Site Scripting (XSS) vulnerability identified in YesWiki version 4.54. This vulnerability allows a remote attacker to execute arbitrary code by injecting a crafted payload into the meta configuration robots field of the application. YesWiki is a web-based wiki software that enables collaborative content creation and management. The vulnerability arises because the input to the meta configuration robots field is not properly sanitized or escaped, allowing malicious scripts to be embedded and executed in the context of users visiting the affected pages. This type of XSS attack can lead to session hijacking, credential theft, defacement, or redirection to malicious sites. The vulnerability does not require authentication, meaning any remote attacker can exploit it without prior access. Although no known exploits are currently reported in the wild, the lack of a patch or mitigation guidance increases the risk of exploitation once the vulnerability becomes widely known. The absence of a CVSS score indicates that the vulnerability has not yet been fully assessed for severity, but the nature of XSS vulnerabilities generally poses a significant risk to web applications and their users.

For European organizations using YesWiki 4.54, this vulnerability could have serious consequences. Exploitation could lead to unauthorized access to user sessions, potentially exposing sensitive corporate or personal information. This is particularly critical for organizations that use YesWiki for internal documentation, knowledge sharing, or collaborative projects involving confidential data. The integrity of the information stored could be compromised, and availability might be affected if attackers use the vulnerability to inject disruptive scripts. Additionally, reputational damage could occur if attackers deface public-facing wiki pages or use the platform to distribute malware. Given the collaborative nature of wikis, the spread of malicious payloads could be rapid, affecting multiple users and systems within an organization. The risk is heightened in sectors with strict data protection regulations such as GDPR, where data breaches can lead to significant fines and legal consequences.

To mitigate this vulnerability, European organizations should first verify if they are running YesWiki version 4.54 or any other potentially affected versions. Immediate steps include disabling or restricting access to the meta configuration robots field to trusted administrators only. Input validation and output encoding should be implemented to sanitize any data entered into this field, preventing script injection. Organizations should monitor official YesWiki channels for patches or updates addressing this vulnerability and apply them promptly once available. In the interim, deploying web application firewalls (WAFs) with custom rules to detect and block suspicious payloads targeting the meta configuration robots field can reduce exploitation risk. Regular security audits and penetration testing focused on XSS vulnerabilities should be conducted. User education on recognizing phishing or suspicious links that might exploit this vulnerability is also recommended. Finally, organizations should consider isolating the YesWiki instance within a segmented network zone to limit potential lateral movement if compromised.