Advisory details:
github_osv / GHSA-gc3m-4mcr-h3pv
| Advisory ID | github_osv/GHSA-gc3m-4mcr-h3pv |
| Aliases |
CVE-2026-33295
|
| Summary | AVideo Affected by Stored XSS via Unescaped Video Title in CDN downloadButtons.php ### Summary WWBN/AVideo contains a stored cross-site scripting vulnerability in the CDN plugin's download buttons component. The `clean_title` field of a video record is interpolated directly into a JavaScript string literal without any escaping, allowing an attacker who can create or modify a video to inject arbitrary JavaScript that executes in the browser of any user who visits the affected download page. ### Details At line 59 of the affected file, the following PHP code constructs a JavaScript function call: ```php downloadURLOrAlertError(url, {}, '<?php echo $video['clean_title']; ?>.' + format, progress); ``` The `clean_title` value is echoed verbatim inside a single-quoted JavaScript string literal. No JavaScript-context escaping is applied, such as wrapping with `json_encode` or htmlspecialchars with appropriate flags. Because the value sits inside a JS string delimited by single quotes, any input containing a single quote character allows an attacker to terminate the string prematurely and inject arbitrary JavaScript expressions. The `clean_title` field is derived from user-supplied video title input, meaning any user with video creation or editing privileges can craft a malicious title. The injected script executes in the security context of whatever user loads the download page for that video, which may include administrators or authenticated users with elevated privileges. ### PoC ```python import requests target = "https://example.com" login_url = f"{target}/user" upload_url = f"{target}/video/addNew" session = requests.Session() session.post(login_url, data={ "user[user]": "attacker", "user[pass]": "attackerpassword" }) malicious_title = "');alert(document.cookie);//" session.post(upload_url, data={ "title": malicious_title, "description": "poc" }) ``` After the video is created, navigate to: ``` https://example.com/plugin/CDN/downloadButtons.php?videos_id=<TARGET_VIDEO_ID> ``` The rendered page will contain: ```javascript downloadURLOrAlertError(url, {}, '');alert(document.cookie);//.' + format, progress); ``` ### Impact Any user who can create or edit a video can store malicious JavaScript that will execute in the browser of any other user who visits the download page for that video. This includes scenarios where an attacker with a low-privilege account targets administrator sessions. Successful exploitation enables session cookie theft, credential harvesting, and actions performed on behalf of the victim within the application. Because the payload is stored server-side and triggers without further attacker interaction, all users who access download pages for attacker-controlled videos are at risk. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 7.4 |
| Risk | 3.7 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv4 | 8.2 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-gc3m-4mcr-h3pv/GHSA-gc3m-4mcr-h3pv.json |
| generic_textual | HIGH |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/WWBN/AVideo | ||
| 30cdd825fa5778c1d678c2402be2413b84ee4833 | Other | https://github.com/WWBN/AVideo/commit/30cdd825fa5778c1d678c2402be2413b84ee4833 |
| CVE-2026-33295 | https://nvd.nist.gov/vuln/detail/CVE-2026-33295 | |
| GHSA-gc3m-4mcr-h3pv | Other | https://github.com/WWBN/AVideo/security/advisories/GHSA-gc3m-4mcr-h3pv |
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:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-23T21:32:31Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/33xxx/CVE-2026-33295.json
Source Advisory: vulnrichment/CVE-2026-33295
[{'Exploitation': 'poc'},
{'Automatable': 'no'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]