dbcve.org
AvideoApplication · Wwbn

CVE-2026-40935

MEDIUM · 5.3 CVSS v3.1 Published 2026-04-21
Fix available
A fix is available. Upgrade to after 29.0 or later.
See remediation →
62/100
Remediation priority · Elevated
Public exploit Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
WWBN AVideo is an open source video platform. In versions 29.0 and prior, `objects/getCaptcha.php` accepts the CAPTCHA length (`ql`) directly from the query string with no clamping or sanitization, letting any unauthenticated client force the server to generate a 1-character CAPTCHA word. Combined with a case-insensitive `strcasecmp` comparison over a ~33-character alphabet and the fact that failed validations do NOT consume the stored session token, an attacker can trivially brute-force the CAPTCHA on any endpoint that relies on `Captcha::validation()` (user registration, password recovery, contact form, etc.) in at most ~33 requests per session. Commit bf1c76989e6a9054be4f0eb009d68f0f2464b453 contains a fix.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
AvideoApplication
Affected:<= 29.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 29.0
Vendor patch github.com →
Recommended fix High confidence

Commit bf1c76989e6a9054be4f0eb009d68f0f2464b453 (or subsequent release after 29.0)

  1. Navigate to the AVideo installation directory on your server
  2. Run `git fetch origin` to fetch the latest commits
  3. Run `git checkout bf1c76989e6a9054be4f0eb009d68f0f2464b453` to checkout the fixed commit, or run `git pull origin <branch>` if the fix has been merged to your current branch
  4. Verify the fix by reviewing the changes in `objects/getCaptcha.php` - ensure the CAPTCHA length parameter is now properly validated/clamped
  5. Restart any PHP-FPM or Apache/Nginx services if necessary
  6. Test that CAPTCHA generation now enforces a minimum length (verify `ql` parameter is sanitized)
  7. Clear any application caches if applicable

Generated from the published advisory — verify against the referenced sources before acting.

We can identify the exact fixed release, upgrade, and verify it in staging — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-40935 in production — separate from our analysis above.

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