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CVE-2026-89256

AVideo Bookmark Plugin Stored XSS via Chapter Names

CVSS 4.0 9.3 CRITICALCVSS 3.1 8.7 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-89256

Published

AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a stored cross-site scripting vulnerability in the Bookmark plugin where chapter names are not encoded before being concatenated into public watch-page HTML. A video owner can inject malicious scripts via the bookmark name parameter, and every visitor of that video executes the payload in the AVideo origin.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-89256

Published

AVideo

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "WWBN",
                    "product": "AVideo",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "git",
                            "lessThanOrEqual": "c3edcc274c389816d434acadac07ee78eaf330c1"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON