CVE-2026-88621Network attack vector

Authenticated file deletion via rejected upload filename

Published Sep 15, 2026 · Updated Sep 15, 2026

Arbitrary file deletion in OneNav 1.2.4 allows remote authenticated users to delete server files through a crafted upload filename. The Api::upload() method passes a user-controlled, non-HTML filename to unlink() during rejection without limiting deletion to the uploaded temporary file. Administrator access is required, and deletion of an existing working-directory file can interrupt the service.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file deletion in OneNav 1.2.4 allows remote authenticated users to delete server files through a crafted upload filename. The Api::upload() method passes a user-controlled, non-HTML filename to unlink() during rejection without limiting deletion to the uploaded temporary file. Administrator access is required, and deletion of an existing working-directory file can interrupt the service.

The record

CVE
CVE-2026-88621
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1485
Attack vector
network
Privileges
admin

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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1485Data Destruction

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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