CVE-2026-43891Public exploitNetwork attack vector

Arbitrary file read via restored snapshot paths

Published May 12, 2026 · Updated May 12, 2026

Path traversal in changedetection.io before 0.55.1 allows remote attackers to read local files via a crafted backup archive. Backup restore copies attacker-controlled history.txt data into the live datastore, and Watch.py preserves path-bearing entries before get_history_snapshot() opens them directly. Access to backup restore is required, and disclosure is limited to files readable by the application process through Preview or the history API.

CVSS severity7.5
High
EPSS probability0.35%
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 changedetection.io before 0.55.1 allows remote attackers to read local files via a crafted backup archive. Backup restore copies attacker-controlled history.txt data into the live datastore, and Watch.py preserves path-bearing entries before get_history_snapshot() opens them directly. Access to backup restore is required, and disclosure is limited to files readable by the application process through Preview or the history API.

The record

CVE
CVE-2026-43891
Published
May 12, 2026
Updated
May 12, 2026
Vendor
changedetection.io
Product
changedetection.io
Classifications
CWE-73, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 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=< 0.55.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

changedetection.io · changedetection.ioversion=< 0.55.1

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-73External Control of File Name or Path
T1005Data from Local System

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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