CVE-2026-25057Network attack vector

Authenticated file overwrite via unchecked ZIP paths

Published Feb 9, 2026 · Updated Feb 9, 2026

Relative path traversal in MarkUs before 2.9.1 allows remote authenticated users to write arbitrary files through assignment ZIP uploads. AssignmentsController#upload_config_files joins unchecked ZIP entry names to automated-test and starter-file directories before writing them. Instructor privileges are required; filesystem permissions bound the write locations, and overwriting application files enables code execution.

CVSS severity9.1
Critical
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Relative path traversal in MarkUs before 2.9.1 allows remote authenticated users to write arbitrary files through assignment ZIP uploads. AssignmentsController#upload_config_files joins unchecked ZIP entry names to automated-test and starter-file directories before writing them. Instructor privileges are required; filesystem permissions bound the write locations, and overwriting application files enables code execution.

The record

CVE
CVE-2026-25057
Published
Feb 9, 2026
Updated
Feb 9, 2026
Vendor
MarkUs Project
Product
MarkUs
Classifications
CWE-23, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 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=< 2.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MarkUs Project · MarkUsversion=< 2.9.1

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-23Relative Path Traversal
T1505.003Web Shell

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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