CVE-2026-27819Public exploitNetwork attack vector

Arbitrary file overwrite via unsanitized ZIP paths

Published Feb 25, 2026 · Updated Feb 25, 2026

Path traversal in Vikunja before 2.0.0 allows attackers to overwrite host files through a crafted ZIP passed to the CLI restore command. The restoreConfig function passes zip.File.Name directly to os.OpenFile without confining the resolved path, and malformed archive structure also causes an out-of-range panic. An administrator or automated process must run the restore command; the panic occurs after the database is wiped, leaving the instance unusable and its data lost.

CVSS severity7.2
High
EPSS probability0.74%
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 Vikunja before 2.0.0 allows attackers to overwrite host files through a crafted ZIP passed to the CLI restore command. The restoreConfig function passes zip.File.Name directly to os.OpenFile without confining the resolved path, and malformed archive structure also causes an out-of-range panic. An administrator or automated process must run the restore command; the panic occurs after the database is wiped, leaving the instance unusable and its data lost.

The record

CVE
CVE-2026-27819
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
Vikunja
Product
Vikunja
Classifications
CWE-22, CWE-248, T1204.002, T1485
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 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=< 2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Vikunja · Vikunjaversion=< 2.0.0

Published CVSS scores

7.2GitHubCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/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.

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 exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-248Uncaught Exception
T1204.002User Execution: Malicious File
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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