Is this vulnerability remotely exploitable?

Yes, if an attacker can convince a user to load a malicious subtitle file (for example by distributing pre-packaged subtitles online), the attacker can cause code execution in the user's browser when the file is opened with the vulnerable extension.

What level of access does an attacker need?

The attacker does not need direct access to the victim's browser or machine; they only need to supply or influence the subtitle file that the victim loads through the asbplayer extension while browsing a streaming site.

What is the safest general fix pattern?

The most robust fix is to strictly treat subtitle content as plain text: validate the subtitle format, remove unsupported constructs, and ensure all displayed text is contextually encoded before rendering, avoiding any APIs that interpret the content as HTML or script.

Severity:

CRITICAL RISK

(9.6)

Stored Cross-Site Scripting via Unrestricted Subtitle File Upload (CWE-434) in asbplayer Chrome Extension

CVE-2025-69771

Published:

Feb 25, 2026

Status:

Modified

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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May 6, 2026

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-434

Impact:

Arbitrary JavaScript Execution and Same-Site Account Compromise

Severity:

CRITICAL RISK

(9.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-434

Impact:

Arbitrary JavaScript Execution and Same-Site Account Compromise

Severity:

CRITICAL RISK

(9.6)

CVSS Version:

3.1

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Stored Cross-Site Scripting via Unrestricted Subtitle File Upload (CWE-434) in asbplayer Chrome Extension

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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