CVE-2026-43891

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.

How to fix CVE-2026-43891

To remediate CVE-2026-43891, upgrade the affected package to a fixed version below.

• —upgrade to 0.55.1 or later
• —upgrade to 0.55.1 or later

Is CVE-2026-43891 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 0.55.1
• from 0, < 0.55.1

CVSS scores

References (6)

• ADVISORYgithub.com/advisories/GHSA-8757-69j2-hx56
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-43891
• PATCHgithub.com/dgtlmoon/changedetection.io
• WEBgithub.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69j2-hx56