CVE-2026-43891: changedetection.io is a free open source web page change detection tool

Q: How do I fix CVE-2026-43891?

changedetection: upgrade to 0.55.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-43891 being exploited?

CVE-2026-43891 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-43891 affect?

CVE-2026-43891 affects changedetection. Severity is high (CVSS 7.5). 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 restor

Q: How urgent is CVE-2026-43891?

Priority 43/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-43891 is a high-severity flaw (CVSS 7.5) affecting changedetection. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 prese

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-73
Published	2026-05-12
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: webtechnologies

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 18:17 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

webtechnologies changedetection UPGRADE

Affected: < 0.55.1

Fixed in: 0.55.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy changedetection || rpm -q changedetection || changedetection --version

2. UPGRADE to 0.55.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade changedetection

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade changedetection

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-43891?

changedetection: upgrade to 0.55.1. Exact commands for each OS are on this page.

Is CVE-2026-43891 being exploited?

CVE-2026-43891 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-43891 affect?

CVE-2026-43891 affects changedetection. Severity is high (CVSS 7.5). 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 restor

How urgent is CVE-2026-43891?

Priority 43/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-33981 MEDIUM 6.5 UPGRADE changedetection.io is a free open source web page change detection tool
CVE-2026-35490 CRITICAL 9.8 UPGRADE changedetection.io is a free open source web page change detection tool
CVE-2026-41895 HIGH 7.5 UPGRADE changedetection.io is a free open source web page change detection tool
CVE-2026-35000 MEDIUM 6.5 UPGRADE ChangeDetection.io versions prior to 0.54.7 contain a protection bypass vulnerability in the SafeXPath3Parser

References

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