Vulnerability in Dgtlmoon Changedetection.io
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Dgtlmoon Changedetection.io — versions < 0.55.1
- Webtechnologies Changedetection
Weakness classification (CWE)
References
- github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69j2-hx56 (Exploit, Mitigation, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Mitigation, Not Applicable, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-43891?
- CVE-2026-43891 is a high-severity vulnerability in Dgtlmoon Changedetection.io, classified under External Control of File Name or Path. CVSS score: 7.5/10. Published 2026-05-12.
- How severe is CVE-2026-43891?
- High severity. CVSS v3 base score is 7.5 out of 10.