XSS in Webrecorder Wabac.js

CVE-2025-58765

wabac.js provides a full web archive replay system, or 'wayback machine', using Service Workers. A Reflected Cross-Site Scripting (XSS) vulnerability exists in the 404 error handling logic of wabac.js v2.23.10 and below. The parameter `req…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (14.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-58765?
CVE-2025-58765 is a high-severity vulnerability in Webrecorder Wabac.js, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2025-09-09.
How severe is CVE-2025-58765?
High severity. CVSS v3 base score is 7.1 out of 10.
Is CVE-2025-58765 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.