Staging Environment: Content and features may be unstable or change without notice.
Advisory details: vulnrichment / CVE-2026-40909
Advisory ID vulnrichment/CVE-2026-40909
Aliases
Summary WWBN AVideo is an open source video platform. In versions 29.0 and prior, the locale save endpoint (`locale/save.php`) constructs a file path by directly concatenating `$_POST['flag']` into the path at line 30 without any sanitization. The `$_POST['code']` parameter is then written verbatim to that path via `fwrite()` at line 40. An admin attacker (or any user who can CSRF an admin, since no CSRF token is checked and cookies use `SameSite=None`) can traverse out of the `locale/` directory and write arbitrary `.php` files to any writable location on the filesystem, achieving Remote Code Execution. Commit 57f89ffbc27d37c9d9dd727212334846e78ac21a fixes the issue.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
System Score Found at
cvssv3.1 8.7
ssvc Track*
Reference id Reference type URL
57f89ffbc27d37c9d9dd727212334846e78ac21a Other https://github.com/WWBN/AVideo/commit/57f89ffbc27d37c9d9dd727212334846e78ac21a
GHSA-6rc6-p838-686f Other https://github.com/WWBN/AVideo/security/advisories/GHSA-6rc6-p838-686f
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N Found at None
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:T/P:M/B:A/M:M/D:R/2026-04-21T20:14:58Z/ Found at None

Vector: SSVCv2/E:P/A:N/T:T/P:M/B:A/M:M/D:R/2026-04-21T20:14:58Z/

Decision: Track*

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/40xxx/CVE-2026-40909.json

Source Advisory: vulnrichment/CVE-2026-40909

View SSVC decision tree 
[{'Exploitation': 'poc'},
 {'Automatable': 'no'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]