
Sites running Weeblr's 4Analytics extension below version 5.0.2 are now flagged as vulnerable. Two unauthenticated stored XSS flaws (CVE-2026-58077 and CVE-2026-57833) can lead to a full site takeover, and an attacker does not need to be logged in to exploit them. Update to 4Analytics 5.0.2, released 15 July 2026. https://weeblr.com/blog/critical-vulnerabilities-2026-07-15
Post summary
Sites using Weeblr 4Analytics below 5.0.2 are vulnerable to unauthenticated stored XSS that can enable complete site takeover; updating to 5.0.2 released on 15 July 2026 mitigates the issue.

