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CVE-2026-43891— changedetection.io: Arbitrary Local File Read via crafted backup restore

Quick assessment

Affected
dgtlmoon changedetection.io
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

changedetection.io是dgtlmoon个人开发者的一个网站变更检测、监控和通知应用程序。 changedetection.io 0.55.1之前版本存在安全漏洞，该漏洞源于信任攻击者控制的从备份文件恢复的快照路径，可能导致读取目标本地文件内容。

CVSS 7.5 · High EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
dgtlmoon changedetection.io < 0.55.1 affected
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I. Basic Information for CVE-2026-43891

Vulnerability Information
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Vulnerability Title
changedetection.io: Arbitrary Local File Read via crafted backup restore
Source: CVE Program / CVE List V5
Vulnerability Description
changedetection.io is a free open source web page change detection tool. Prior to 0.55.1, the vulnerability is caused by trusting attacker-controlled snapshot paths restored from backup files. The vulnerable flow starts in the backup restore logic. When a backup ZIP is restored, the application extracts the archive and copies each restored watch UUID directory directly into the live datastore using shutil.copytree(entry.path, dst_dir). This preserves attacker-controlled files inside the restored watch directory, including history.txt. After restore, the application parses history.txt in the watch history property and returns the contents of the targeted local file. This vulnerability is fixed in 0.55.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
changedetection.io 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
changedetection.io是dgtlmoon个人开发者的一个网站变更检测、监控和通知应用程序。 changedetection.io 0.55.1之前版本存在安全漏洞，该漏洞源于信任攻击者控制的从备份文件恢复的快照路径，可能导致读取目标本地文件内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
dgtlmoon changedetection.io < 0.55.1 -

II. Public POCs for CVE-2026-43891

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III. Intelligence Information for CVE-2026-43891

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Vendor Advisories for CVE-2026-43891 (1)

IV. Related Vulnerabilities

Same product: changedetection.io
Same vendor: dgtlmoon
Same weakness: CWE-73

V. Comments for CVE-2026-43891

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