CVE-2026-43891: 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…

PriorityP346high7.5CVSS 3.1

AVNACLPRNUINSUCHINAN

EPSS

0.35%

27.3th percentile

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
dgtlmoon	changedetection.io	< 0.55.1	0.55.1
dgtlmoon	changedetection.io	>= 0 < 0.55.1	0.55.1
webtechnologies	changedetection	< 0.55.1	0.55.1

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.