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WWBN AVideo EUVDEUVD-2026-72008

| CVE-2026-86187 HIGH
Use of Insufficiently Random Values (CWE-330)
2026-09-05 VulnCheck GHSA-hfr9-8xm8-cq6w
7.4
CVSS 4.0 · Vendor: VulnCheck
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Obtain AVideo database dump via secondary vulnerability
  2. Delivery
    Extract external-login account unsalted MD5 hashes
  3. Exploit
    Enumerate all 2^31 rand() output values offline
  4. Execution
    Crack unsalted MD5 in seconds on GPU hardware
  5. Impact
    Authenticate to AVideo as compromised account

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A04:2025 - Cryptographic Failures
ASVS 5.0
V11 - Cryptography Cryptographic random values
Exploitation Conditions

Exploitation requires prior access to the AVideo password hash database - whether through a separate vulnerability (SQL injection, exposed database backup, misconfigured cloud storage) or privileged administrative access to the database server. Only accounts provisioned through the external-login pathway are affected; standard accounts may not use rand()-based password generation. The offline brute-force phase requires no interaction with the AVideo application itself and can be performed on commodity hardware. Limiting factors: (1) the attacker must independently obtain hash access before this vulnerability is useful; (2) only external-login accounts are in scope; (3) recovering a password yields access only to that specific AVideo account, not broader system access unless credentials are reused.

Impact

The CVSS 4.0 vector (AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N) accurately captures the significant prerequisites: high attack complexity and high privilege requirements reflect that the attacker must first obtain the password hash database before the weak PRNG becomes exploitable. This two-stage requirement substantially limits opportunistic exploitation. However, if a secondary vulnerability such as SQL injection, misconfigured database backup, or insider access provides hash exposure, the weak PRNG converts that lower-severity breach into a full credential compromise across all external-login accounts. No EPSS score or CISA KEV status is available in the provided data, so exploitation probability cannot be quantified numerically. No public exploit specific to this CVE has been identified at time of analysis. The real-world risk is moderate: high-impact once hash access is achieved, but not directly exploitable over the network without a prerequisite breach.

Exploit ScenarioDerived

An attacker who has obtained an AVideo database dump - through SQL injection, an exposed backup file, or a compromised database host - extracts the MD5 hashes of external-login accounts. Using a GPU-based MD5 cracker (e.g., hashcat), the attacker iterates over all 2^31 possible rand() output values, computing the corresponding MD5 for each, and recovers matching plaintext passwords in under a minute. The attacker then authenticates to the AVideo web interface as the victim user, gaining full account access. No public PoC tool specific to this CVE has been identified.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 05, 2026

External-login account password generation in WWBN AVideo uses PHP's non-cryptographic rand() function, producing a keyspace of only 2^31 integers, and stores resulting passwords as unsalted MD5 hashes. An attacker who obtains the AVideo password hash database can exhaustively search the entire 2-billion-entry keyspace in seconds to minutes on commodity GPU hardware, recovering plaintext credentials for all external-login accounts. No public exploit has been identified at time of analysis; the CVSS 4.0 score of 7.4 reflects the prerequisite of prior hash access.

RemediationAI

Apply the fix detailed in GitHub Security Advisory GHSA-h3ff-c2qq-pr2g. The remediation should replace PHP's rand() with a cryptographically secure random number generator such as random_bytes() and replace unsalted MD5 storage with PHP's password_hash() using bcrypt or Argon2id. No specific patched release version is confirmed in the available data - consult the GHSA advisory directly for the fixed tag. As an immediate compensating control pending upgrade, administrators should disable external-login account creation if that feature is not operationally required; the trade-off is loss of external-login functionality until a patch is applied. Additionally, force-reset passwords for all existing external-login accounts and audit login activity for those accounts for signs of unauthorized access. If database credentials or backups have been exposed through any separate incident, treat all external-login account passwords as compromised regardless of patch status.

Affected VersionsENISA

AVideo 0 ≤29.0

Affected Packages

euvd avideo no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

WWBN AVideo is an open-source PHP video-hosting platform (CPE: cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*). The vulnerability is classified under CWE-330 (Use of Insufficiently Random Values) and manifests specifically in the external-login account provisioning workflow, where PHP's rand() function-a Mersenne-Twister-derived PRNG seeded from low-entropy sources-is used to generate account passwords. The effective search space is bounded to 2^31 possible values (approximately 2.1 billion). These passwords are then hashed using MD5 without a salt, eliminating computational resistance against pre-computed table lookups. The combination of a trivially small keyspace and unsalted MD5 means offline attacks are feasible on commodity hardware: a modern GPU can compute billions of MD5 hashes per second, reducing recovery time to seconds or minutes across the full rand() output range.

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Severity by source

Vendor (VulnCheck) PRIMARY 7.4 HIGH
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
vuln.today AI 5.9 MEDIUM

Hash database access prerequisite warrants AC:H and PR:H; password recovery yields C:H/I:H; no availability impact from credential theft.

3.1 AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
High
Attack Requirements
Present
Privileges Required
High
User Interaction
None
Vulnerable system: Confidentiality
High
Vulnerable system: Integrity
High
Vulnerable system: Availability
None
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

DescriptionCVE.org

WWBN AVideo generates passwords for external-login accounts using rand() instead of a cryptographic generator, producing only 31-bit integers. Attackers with access to password hashes can recover plaintext passwords in minutes through offline brute-force attacks due to unsalted MD5-based hashing.

Technical POC Analysis

CVE-2026-86187 - WWBN/AVideo weak external-login password generation CWE-330 (and CWE-338): insufficiently random values / cryptographically weak PRNG.

Full technical POC analysis - root cause, step-by-step exploitation and patch breakdown - is part of the Pro and Business plans.

Executive ViewAI

Why It Matters

WWBN AVideo's external login system generates passwords using a weak algorithm (2^31 keyspace) and stores credentials as unsalted MD5 hashes, enabling complete credential recovery in minutes if the password database is accessed. Organizations operating AVideo face mass account compromise for all external login users should the database be breached. Immediate database access controls and user credential resets are required pending vendor patch.

Business Impact: High
Compensating Controls

Implement strict database access controls with multi-factor authentication for AVideo administrators. Enable comprehensive audit logging on password database queries and AVideo login attempts. Mandate password changes across all external login accounts using enforced complexity requirements. Disable the external login feature if risk tolerance does not permit continued operation pending patch availability.

Threat Intelligence Overview

EPSS Score
0.2%
Top 88% exploitable
Prevalence
Low
niche open-source self-hosted video platform
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact
High

Priority Score

37
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +37
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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