CVE-2026-43891
Prior to 0.55.1, the vulnerability is caused by trusting attacker-controlled snapshot paths restored from backup files.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.35% probability · 29th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-73
- Affected
- webtechnologies/changedetection
- Source
- security-advisories@github.com
References
- https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69j2-hx56Exploit, Mitigation, Vendor Advisory
- https://github.com/pocket-id/pocket-id/security/advisories/GHSA-w6p7-2fxx-4f44Exploit, Mitigation, Not Applicable, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.