CVE-2026-33500 | WWBN AVideo up to 26.0 Markdown Link inlineLink cross site scripting

VDB-352548 · CVE-2026-33500 · EUVD-2026-13916 WWBN AVIDEO UP TO 26.0 MARKDOWN LINK INLINELINK CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.4 $0-$5k 4.03+ Summaryinfo A vulnerability classified as problematic was found in WWBN AVideo up to 26.0. This impacts the function inlineLink of the component Markdown Link Handler. The manipulation results in cross site scripting. This vulnerability was named CVE-2026-33500. The attack may be performed from remote. There is no available exploit. It is advisable to implement a patch to correct this issue. Detailsinfo A vulnerability classified as problematic has been found in WWBN AVideo up to 26.0. Affected is the function inlineLink of the component Markdown Link Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes: WWBN AVideo is an open source video platform. In versions up to and including 26.0, the fix for CVE-2026-27568 (GHSA-rcqw-6466-3mv7) introduced a custom `ParsedownSafeWithLinks` class that sanitizes raw HTML `` and `` tags in comments, but explicitly disables Parsedown's `safeMode`. This creates a bypass: markdown link syntax `[text](javascript:alert(1))` is processed by Parsedown's `inlineLink()` method, which does not go through the custom `sanitizeATag()` sanitization (that only handles raw HTML tags). With `safeMode` disabled, Parsedown's built-in `javascript:` URI filtering (`sanitiseElement()`/`filterUnsafeUrlInAttribute()`) is also inactive. An attacker can inject stored XSS via comment markdown links. Commit 3ae02fa240939dbefc5949d64f05790fd25d728d contains a patch. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-33500 since 03/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007. Applying the patch 3ae02fa240939dbefc5949d64f05790fd25d728d is able to eliminate this problem. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-13916). Productinfo Vendor WWBN Name AVideo Version 26.0 License open-source Website Product: https://github.com/WWBN/AVideo/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.4 VulDB Meta Temp Score: 4.4 VulDB Base Score: 3.5 VulDB Temp Score: 3.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.4 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Cross site scripting CWE: CWE-79 / CWE-94 / CWE-74 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Patch Status: 🔍 0-Day Time: 🔒 Patch: 3ae02fa240939dbefc5949d64f05790fd25d728d Timelineinfo 03/20/2026 CVE reserved 03/23/2026 +3 days Advisory disclosed 03/23/2026 +0 days VulDB entry created 03/23/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-33500 (🔒) GCVE (CVE): GCVE-0-2026-33500 GCVE (VulDB): GCVE-100-352548 EUVD: 🔒 Entryinfo Created: 03/23/2026 17:49 Updated: 03/23/2026 20:49 Changes: 03/23/2026 17:49 (65), 03/23/2026 20:49 (1) Complete: 🔍 Cache ID: 99:014:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸