CVE-2026-26100

Low-privileged local file manipulation

Published Feb 20, 2026 · Updated Feb 20, 2026

Incorrect permission assignment in Owl Cyber Defense OPDS 2.2.0.4 and earlier allows local users to manipulate files via a crafted network request. The CNA and Nozomi advisory do not identify the critical resource, affected file, request endpoint, or permission operation that accepts untrusted input. Low-privileged local access is required, and the reported consequence is limited to file integrity with no disclosed confidentiality or availability impact.

CVSS severity5.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect permission assignment in Owl Cyber Defense OPDS 2.2.0.4 and earlier allows local users to manipulate files via a crafted network request. The CNA and Nozomi advisory do not identify the critical resource, affected file, request endpoint, or permission operation that accepts untrusted input. Low-privileged local access is required, and the reported consequence is limited to file integrity with no disclosed confidentiality or availability impact.

The record

CVE
CVE-2026-26100
Published
Feb 20, 2026
Updated
Feb 20, 2026
Vendor
Owl Cyber Defense
Product
OPDS
Classifications
CWE-732, CAPEC-165, T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 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 <=2.2.0.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Owl Cyber Defense · OPDSversion=0 <=2.2.0.4

Published CVSS scores

6.8Nozomi NetworksCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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.

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-732Incorrect Permission Assignment for Critical Resource
CAPEC-165File Manipulation
T1565.001Stored Data Manipulation

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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