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Vulnerability details: VCID-fnhh-j4zf-7ya9
Vulnerability ID VCID-fnhh-j4zf-7ya9
Aliases CVE-2026-43891
GHSA-8757-69j2-hx56
PYSEC-2026-30
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-73 External Control of File Name or Path
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00037 https://api.first.org/data/v1/epss?cve=CVE-2026-43891
epss 0.00037 https://api.first.org/data/v1/epss?cve=CVE-2026-43891
cvssv3.1 7.5 https://github.com/advisories/GHSA-8757-69j2-hx56
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-8757-69j2-hx56
cvssv3.1 7.5 https://github.com/dgtlmoon/changedetection.io
generic_textual HIGH https://github.com/dgtlmoon/changedetection.io
cvssv3.1 7.5 https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69j2-hx56
cvssv3.1_qr HIGH https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69j2-hx56
generic_textual HIGH https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69j2-hx56
ssvc Track https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69j2-hx56
cvssv3.1 7.5 https://github.com/pocket-id/pocket-id/security/advisories/GHSA-w6p7-2fxx-4f44
generic_textual HIGH https://github.com/pocket-id/pocket-id/security/advisories/GHSA-w6p7-2fxx-4f44
cvssv3.1 7.5 https://github.com/pypa/advisory-database/tree/main/vulns/changedetection-io/PYSEC-2026-30.yaml
generic_textual HIGH https://github.com/pypa/advisory-database/tree/main/vulns/changedetection-io/PYSEC-2026-30.yaml
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2026-43891
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-43891
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-43891
https://github.com/advisories/GHSA-8757-69j2-hx56
https://github.com/dgtlmoon/changedetection.io
https://github.com/pypa/advisory-database/tree/main/vulns/changedetection-io/PYSEC-2026-30.yaml
https://nvd.nist.gov/vuln/detail/CVE-2026-43891
GHSA-8757-69j2-hx56 https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69j2-hx56
GHSA-w6p7-2fxx-4f44 https://github.com/pocket-id/pocket-id/security/advisories/GHSA-w6p7-2fxx-4f44
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/advisories/GHSA-8757-69j2-hx56
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/dgtlmoon/changedetection.io
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69j2-hx56
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-13T14:36:12Z/ Found at https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8757-69j2-hx56
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/pocket-id/pocket-id/security/advisories/GHSA-w6p7-2fxx-4f44
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/changedetection-io/PYSEC-2026-30.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-43891
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.11452
EPSS Score 0.00037
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:41:18.905804+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/43xxx/CVE-2026-43891.json 38.6.0