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CVE-2026-90537 – Missing Authorization / Sensitive Data Exposure – WWBN AVideo (through commit c3edc

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Summary

CVE-2026-90537 is a missing authorization vulnerability in WWBN AVideo’s Scheduler plugin that allows unauthenticated attackers to access scheduled email jobs by supplying a site-wide "daily" token. The flaw lets attackers enumerate scheduler jobs, read private live-stream titles and email addresses, and trigger the sending of scheduled emails. The vulnerability carries a CVSS score of 8.8 and requires no authentication or user interaction to exploit.

Technical details

  • Root cause: plugin/Scheduler/sendEmail.json.php authorizes requests solely by validating a site-wide daily token (via isTokenValid()/getToken()) rather than verifying that the requester owns or is otherwise permitted to access the specific scheduler job requested.
  • Trigger conditions: The daily token is not user- or purpose-bound — it is broadly distributed to any user capable of streaming on the site (e.g., obtainable from Live pages), so any holder of a valid token can query arbitrary scheduler jobs by ID.
  • Attack vector: Network-based (AV:N); the attacker sends a request to the endpoint with a scheduler job ID and a valid daily token — no authentication or privileged access is required.
  • Impact: The endpoint loads the requested Scheduler_commands record and returns sensitive fields (subject, body, recipient email addresses) and can invoke sendSiteEmail() to actually dispatch the scheduled email, without any ownership or permission check. This exposes private live-stream titles and mailbox addresses and allows unauthorized triggering of email sends.

Affected software

  • WWBN AVideo — all versions through commit c3edcc274c389816d434acadac07ee78eaf330c1

Severity

  • CVSS: 8.8 (High)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: No patched release was available at the time of disclosure. Monitor the WWBN/AVideo repository and GitHub Security Advisory GHSA-qq59-3jwp-hgj9 for a fix and upgrade as soon as one is published.
  • Workarounds/network mitigations: Restrict or disable public access to plugin/Scheduler/sendEmail.json.php (e.g., via reverse-proxy or web server access rules) until a patch is available. Treat the site’s daily token as sensitive, limit its distribution, and monitor logs for anomalous requests to the Scheduler email endpoint enumerating job IDs.

References

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