CVE-2026-8209Public exploitNetwork attack vector

Authenticated service interruption via arbitrary archive path

Published May 9, 2026 · Updated May 9, 2026

Path traversal in Gibbon before 30.0.01 allows remote authenticated users with Teacher privileges to interrupt the web application. The report ZIP import confirmation handler accepts an arbitrary archive path, attempts extraction, and deletes the referenced file whether extraction succeeds or fails. Teacher-level access is required, and targeting a web application PHP file removes it from the host and leaves the application unavailable.

CVSS severity6.9
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Gibbon before 30.0.01 allows remote authenticated users with Teacher privileges to interrupt the web application. The report ZIP import confirmation handler accepts an arbitrary archive path, attempts extraction, and deletes the referenced file whether extraction succeeds or fails. Teacher-level access is required, and targeting a web application PHP file removes it from the host and leaves the application unavailable.

The record

CVE
CVE-2026-8209
Published
May 9, 2026
Updated
May 9, 2026
Vendor
Gibbon Foundation
Product
Gibbon
Classifications
CWE-23, T1485
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 9, 2026CVE publishedPublication date reported by the CVE source.
  2. May 9, 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 <30.0.01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Gibbon Foundation · Gibbonversion=0 <30.0.01

Published CVSS scores

6.9PRJBLKCVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

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

Weakness, pattern, technique

CWE-23Relative Path Traversal
T1485Data Destruction

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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