CVE-2026-33500Public exploitNetwork attack vector

Stored XSS via unsanitized markdown link schemes

Published Mar 23, 2026 · Updated Mar 23, 2026

Stored XSS in World Wide Broadcast Network AVideo 26.0 and earlier allows remote authenticated users to execute script through comment links. ParsedownSafeWithLinks disables safeMode, so inlineLink converts javascript-scheme markdown into anchors without the custom raw-HTML allowlist. Any user permitted to comment can store a link, but script execution requires another user to click it and can expose or alter that viewer's session data.

CVSS severity5.4
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in World Wide Broadcast Network AVideo 26.0 and earlier allows remote authenticated users to execute script through comment links. ParsedownSafeWithLinks disables safeMode, so inlineLink converts javascript-scheme markdown into anchors without the custom raw-HTML allowlist. Any user permitted to comment can store a link, but script execution requires another user to click it and can expose or alter that viewer's session data.

The record

CVE
CVE-2026-33500
Published
Mar 23, 2026
Updated
Mar 23, 2026
Vendor
World Wide Broadcast Network
Product
AVideo
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=<= 26.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

World Wide Broadcast Network · AVideoversion=<= 26.0

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

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

Technologies

Your stack

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Your stack

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