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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Webtechnologies | Changedetection | < 0.55.1 |
Related Weaknesses (CWE)
References
- https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69jExploitMitigationVendor Advisory
- https://github.com/pocket-id/pocket-id/security/advisories/GHSA-w6p7-2fxx-4f44ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-43891?
CVE-2026-43891 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 vul...
How severe is CVE-2026-43891?
CVE-2026-43891 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43891?
Check the references section above for vendor advisories and patch information. Affected products include: Webtechnologies Changedetection.