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CVE-2026-82644 – Authentication Rate-Limit Bypass (Brute-Force) – WWBN AVideo ≤ commit e01e41ecc (al

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Summary

CVE-2026-82644 is a rate-limiting bypass vulnerability in WWBN AVideo that allows unauthenticated attackers to perform unrestricted password-guessing attacks against the login endpoint and 13 other sensitive endpoints. The flaw stems from the application’s bot-detection logic silently discarding brute-force attempt counters for requests it classifies as bot traffic, effectively disabling the protection for any attacker who omits or spoofs their User-Agent header. The issue carries a CVSS v4.0 base score of 8.7 (High).

Technical details

  • Root cause: the enforceRateLimit() function stores its attempt counter through a caching layer (ObjectYPT::setCacheGlobal) that silently discards writes whenever the request is classified as bot traffic by the isBot() function.
  • isBot() treats a missing User-Agent header as bot traffic by default, and also matches common bot identifiers such as curl, bot, crawler, and spider.
  • Because the counter never increments for such clients, the rate limit never triggers, regardless of how many requests are sent.
  • Attack vector: network, unauthenticated, no user interaction required — an attacker simply omits the User-Agent header (or uses a default tool User-Agent like curl‘s) when sending requests.
  • Impact: unrestricted, automatable password-guessing (brute-force) attacks against login.json.php and at least 13 other endpoints that rely on the same rate-limiting function, threatening account confidentiality/takeover.

Affected software

  • WWBN AVideo — current development version at commit e01e41ecc and all earlier versions (no version boundary specified by the advisory; all releases relying on enforceRateLimit() are affected).

Severity

  • CVSS v4.0 Base Score: 8.7 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
  • CVSS v3.1 Base Score: 7.5 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: No official patched release/commit is currently available from the vendor at time of publication; a community-proposed fix (introducing an $ignoreBot flag so rate-limit counters bypass bot-filtering while page-cache behavior is preserved) has been submitted but not yet merged. Monitor the vendor repository for an official fix and upgrade as soon as one is released.
  • Workarounds/network mitigations until a patch is available:
    • Enforce rate limiting and brute-force protection at the network/edge layer (WAF, reverse proxy, or API gateway) independent of the application’s own logic, ensuring it does not exempt requests with missing or bot-like User-Agent headers.
    • Monitor and alert on high-volume login/authentication attempts from clients with missing or generic User-Agent strings (e.g., curl, blank, bot).
    • Consider enforcing multi-factor authentication and strong password policies to reduce the impact of successful brute-force attempts.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: Sign In - AVideo, AVideo
  • Raw response body: id="avideoModal", avideoAlert(, avideoModalIframe(

References

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