CVE-2026-66372

Session hijacking via predictable token seeds

Published Sep 15, 2026 · Updated Sep 15, 2026

Predictable web session tokens in Digital Watchdog VMAX recorders allow attackers on an adjacent network to hijack authenticated sessions. The web-session token generator uses an insufficiently random seed, limiting possible token values to the seed space. Attackers must reach the recorder and predict a live token; success permits session impersonation and actions authorized to that session.

CVSS severity6.8
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Predictable web session tokens in Digital Watchdog VMAX recorders allow attackers on an adjacent network to hijack authenticated sessions. The web-session token generator uses an insufficiently random seed, limiting possible token values to the seed space. Attackers must reach the recorder and predict a live token; success permits session impersonation and actions authorized to that session.

The record

CVE
CVE-2026-66372
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Digital Watchdog
Product
VMAX IP G4 NVR
Classifications
CWE-337, T1550.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=All

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Digital Watchdog · VMAX IP G4 NVRversion=All
Digital Watchdog · VMAX A1 G4 DVRversion=All
Digital Watchdog · VMAX A1 Plus DVRversion=All

Published CVSS scores

7.6CISACVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
6.8CISACVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-337Predictable Seed in Pseudo-Random Number Generator (PRNG)
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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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