Advisory details:
github_osv / GHSA-rcqw-6466-3mv7
| Advisory ID | github_osv/GHSA-rcqw-6466-3mv7 |
| Aliases |
CVE-2026-27568
|
| Summary | AVideo has Stored Cross-Site Scripting via Markdown Comment Injection ## Vulnerability Type Stored Cross-Site Scripting (XSS) — CWE-79. ## Affected Product/Versions AVideo 18.0. ## Root Cause Summary AVideo allows Markdown in video comments and uses Parsedown (v1.7.4) without Safe Mode enabled. Markdown links are not sufficiently sanitized, allowing `javascript:` URIs to be rendered as clickable links. ## Impact Summary An authenticated low-privilege attacker can post a malicious comment that injects persistent JavaScript. When another user clicks the link, the attacker can perform actions such as session hijacking, privilege escalation (including admin takeover), and data exfiltration. ## Resolution/Fix The issue was confirmed and fixed in the master branch. An official release will be published soon. ## Workarounds Until the release is available, validate and block unsafe URI schemes (e.g., `javascript:`) before rendering Markdown, and enable Parsedown Safe Mode. ## Credits/Acknowledgement Reported by Arkadiusz Marta (https://github.com/arkmarta/). |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 4.6 |
| Risk | 2.3 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv4 | 5.1 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-rcqw-6466-3mv7/GHSA-rcqw-6466-3mv7.json |
| generic_textual | MODERATE |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/WWBN/AVideo | ||
| https://github.com/WWBN/AVideo/commit/ade348ed6d28b3797162c3d9e98054fb09ec51d7 | ||
| https://github.com/WWBN/AVideo/releases/tag/21.0 | ||
| CVE-2026-27568 | https://nvd.nist.gov/vuln/detail/CVE-2026-27568 | |
| GHSA-rcqw-6466-3mv7 | https://github.com/WWBN/AVideo/security/advisories/GHSA-rcqw-6466-3mv7 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-02-27T19:00:11Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/27xxx/CVE-2026-27568.json
Source Advisory: vulnrichment/CVE-2026-27568
[{'Exploitation': 'none'},
{'Automatable': 'no'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]