CVE-2025-26756 describes a Stored Cross-site Scripting vulnerability in grimdonkey's Magic the Gathering Card Tooltips (versions up to 3.5.0). The issue arises due to improper neutralization of input during web page generation, which allows attackers to inject and store malicious scripts that execute when users view the affected content. The vulnerability has a CVSS 3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L), indicating network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and low impact on confidentiality, integrity, and availability. There is no vendor advisory or patch information available at this time.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to partial compromise of user confidentiality, integrity, and availability. The scope change in the CVSS vector indicates that the vulnerability affects components beyond the initially vulnerable component. However, no known exploits are currently reported in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should exercise caution with untrusted input and consider applying web application firewall rules or input sanitization as temporary mitigations. Monitor vendor channels for updates regarding patches or official fixes.