Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:LCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2026-40925 is a high-severity CSRF (CWE-352) vulnerability in Wwbn Avideo. Its CVSS base score is 8.3 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) and SC-23 (Session Authenticity) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-40925 is a cross-site request forgery (CSRF) vulnerability in WWBN AVideo, an open source video platform. The issue affects versions 29.0 and prior, specifically in the `objects/configurationUpdate.json.php` endpoint (also accessible via the `/updateConfig` route). This endpoint persists dozens of global site settings directly from `$_POST` data, protected only by a `User::isAdmin()` check. It lacks calls to `forbidIfIsUntrustedRequest()`, verification of a `globalToken`, and validation of the Origin or Referer header, enabling unauthorized configuration changes.
An attacker can exploit this vulnerability by tricking a logged-in administrator into visiting an attacker-controlled webpage. AVideo intentionally configures `session.cookie_samesite=None` to support cross-origin iframe embedding, allowing the browser to automatically submit a cross-origin POST request. This single request can overwrite critical site settings, including the encoder URL, SMTP credentials, site `<head>` HTML, logo, favicon, contact email, and more. The CVSS v3.1 base score of 8.3 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L) reflects its network accessibility, low complexity, lack of required privileges (beyond user interaction), high confidentiality and integrity impacts, and low availability impact.
Mitigation is available via a patch in commit f9492f5e6123dff0292d5bb3164fde7665dc36b4. Security practitioners should review the GitHub security advisory at GHSA-vvfw-4m39-fjqf for full details on the fix and upgrade instructions.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-24485
Vulnerability Data
WWBN AVideo is an open source video platform. In versions 29.0 and prior, `objects/configurationUpdate.json.php` (also routed via `/updateConfig`) persists dozens of global site settings from `$_POST` but protects the endpoint only with `User::isAdmin()`. It does not call `forbidIfIsUntrustedRequest()`, does not…
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verify a `globalToken`, and does not validate the Origin/Referer header. Because AVideo intentionally sets `session.cookie_samesite=None` to support cross-origin iframe embedding, a logged-in administrator who visits an attacker-controlled page will have the browser auto-submit a cross-origin POST that rewrites the site's encoder URL, SMTP credentials, site `<head>` HTML, logo, favicon, contact email, and more in a single request. Commit f9492f5e6123dff0292d5bb3164fde7665dc36b4 contains a fix.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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V3.3.2V3.5.1V10.2.1
Mitigating Controls (NIST 800-53 r5) AI
Access enforcement requires verifying that state-changing requests originate from the authenticated user rather than a forged cross-site source.
Protecting session authenticity prevents attackers from replaying or forging authenticated requests via the victim's browser.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly require anti-CSRF controls such as tokens or SameSite attributes.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
By denying access to phishing or malicious sites, the control lowers the likelihood that a user will be tricked into submitting a forged request that performs an unintended action on another site.