CVE-2026-86186Public exploitNetwork attack vector

Unauthenticated password guessing via bot cache exclusion

Published Sep 5, 2026 · Updated Sep 8, 2026

Improper rate limiting in WWBN AVideo 29.0 and earlier allows remote attackers to make unlimited password guesses through the API. API::checkRateLimit stores per-IP attempt counters through ObjectYPT::setCacheGlobal, but the cache write rejects bot User-Agent clients, so their counters never advance. No authentication or user interaction is required; a crafted bot header defeats limits for eight operations, including account and video-password checks.

CVSS severity6.3
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper rate limiting in WWBN AVideo 29.0 and earlier allows remote attackers to make unlimited password guesses through the API. API::checkRateLimit stores per-IP attempt counters through ObjectYPT::setCacheGlobal, but the cache write rejects bot User-Agent clients, so their counters never advance. No authentication or user interaction is required; a crafted bot header defeats limits for eight operations, including account and video-password checks.

The record

CVE
CVE-2026-86186
Published
Sep 5, 2026
Updated
Sep 8, 2026
Vendor
WWBN
Product
AVideo
Classifications
CWE-693, CWE-307, T1110.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=29.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WWBN · AVideoversion=0 <=29.0

Published CVSS scores

6.5VulnCheck CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
9.4WWBN GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
6.3VulnCheck CNACVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
CWE-307Improper Restriction of Excessive Authentication Attempts
T1110.001Password Guessing

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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