CVE-2025-58765Network attack vector

Browser script execution via unescaped 404 URL

Published Sep 9, 2025 · Updated Sep 10, 2025

Reflected XSS in Webrecorder wabac.js 2.23.10 and earlier allows remote attackers to execute JavaScript through a crafted archive URL. The getHTMLNotFound function in src/notfound.ts interpolates requestURL directly into a quoted inline-script assignment without JavaScript-safe encoding. Exploitation requires a victim to open the malicious URL; the resulting script runs in the archive viewer, while the error page's CORS policy limits some effects.

CVSS severity7.1
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reflected XSS in Webrecorder wabac.js 2.23.10 and earlier allows remote attackers to execute JavaScript through a crafted archive URL. The getHTMLNotFound function in src/notfound.ts interpolates requestURL directly into a quoted inline-script assignment without JavaScript-safe encoding. Exploitation requires a victim to open the malicious URL; the resulting script runs in the archive viewer, while the error page's CORS policy limits some effects.

The record

CVE
CVE-2025-58765
Published
Sep 9, 2025
Updated
Sep 10, 2025
Vendor
Webrecorder
Product
wabac.js
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.23.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Webrecorder · wabac.jsversion=< 2.23.11

Published CVSS scores

7.1GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo