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CVE-2026-41895

changedetection.io: XXE vulnerability in the changedetection.io project

8.2 HighFix available

changedetection.io is a free open source web page change detection tool. In 0.54.9 and earlier, xpath_filter() switches to XML mode for XML/RSS content and creates etree.XMLParser(strip_cdata=False) without explicitly disabling external entity resolution, external DTD loading, or network-backed entity lookup. The helper then parses untrusted XML bytes directly with etree.fromstring(...).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.27%Up 0.2 points since May 13, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.2

changedetection.io: XXE vulnerability in the changedetection.io project

changedetection.io is a free open source web page change detection tool. In 0.54.9 and earlier, xpath_filter() switches to XML mode for XML/RSS content and creates etree.XMLParser(strip_cdata=False) without explicitly disabling external entity resolution, external DTD loading, or network-backed entity lookup. The helper then parses untrusted XML bytes directly with etree.fromstring(...).

Record
CVE-2026-41895
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-611
Updated
2026-11-02
EUVDEUVD-2026-29698 8.2

changedetection.io is a free open source web page change detection tool. In 0.54.9 and earlier, xpath_filter() switches to XML mode for XML/RSS content and creates etree.XMLParser(strip_cdata=False) without explicitly disabling external entity resolution, external DTD loading, or network-backed entity lookup. The helper then parses untrusted XML bytes directly with etree.fromstring(...).

Record
EUVD-2026-29698
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-v7cp-2cx9-x793 8.2

changedetection.io project has an XXE vulnerability

changedetection.io_XXE_01 Vulnerability Report: We discovered a XXE vulnerability in the changedetection.io project

While analyzing the code logic, it was determined that an area may lead to unintended behavior under specific conditions. With the project's security in mind, see the analysis results to discern whether this may indicate a potential security risk.

Overview

  • SOURCE_VERSION: 0.54.9 (9f3a9fdc18bba404244801e5df8109e213ce9ff4)
  • Vulnerability type: XXE
  • Finding title: XML XPath helpers parse untrusted XML with entity resolution left to lxml defaults
  • Affected location: changedetectionio/html_tools.py:287

Root Cause

xpath_filter() switches to XML mode for XML/RSS content and creates etree.XMLParser(strip_cdata=False) without explicitly disabling external entity resolution, external DTD loading, or network-backed entity lookup. The helper then parses untrusted XML bytes directly with etree.fromstring(...).

Source-to-Sink Chain

  1. Untrusted XML/RSS response content is fetched from monitored URLs.
  2. Stream detection marks the content as XML/RSS and the include-filter path invokes xpath_filter(..., is_xml=True).
  3. xpath_filter() builds the default XML parser and calls etree.fromstring(...) at changedetectionio/html_tools.py:287.
  4. External entity declarations in attacker XML can be expanded by parser-default behavior in affected runtime combinations.

Exploitation Preconditions

  1. Attacker controls the watched XML/RSS response body.
  2. The watch uses an XPath include filter that triggers XML helper parsing.
  3. Runtime parser behavior allows external entity expansion (for example, vulnerable dependency/default combinations).
  4. The process can read the referenced local resource.

Risk

The XML helper path can turn watch processing into a local file disclosure primitive when entity expansion is enabled by parser defaults.

Impact

Sensitive local files can be exposed into extracted watch output, diff history, and downstream notification channels.

Remediation

  1. Harden XML parser construction with resolve_entities=False, load_dtd=False, and no_network=True.
  2. Reject DOCTYPE/entity declarations for untrusted XML if DTD features are unnecessary.
  3. Add regression tests that assert external entities are never expanded in XPath XML helper flows.
Record
GHSA-v7cp-2cx9-x793
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-611
Updated
2026-11-02
NVD 8.2

changedetection.io is a free open source web page change detection tool. In 0.54.9 and earlier, xpath_filter() switches to XML mode for XML/RSS content and creates etree.XMLParser(strip_cdata=False) without explicitly disabling external entity resolution, external DTD loading, or network-backed entity lookup. The helper then parses untrusted XML bytes directly with etree.fromstring(...).

Record
CVE-2026-41895
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-611
Updated
2026-11-02
OSV 8.2

changedetection.io: XXE vulnerability in the changedetection.io project

changedetection.io is a free open source web page change detection tool. In 0.54.9 and earlier, xpath_filter() switches to XML mode for XML/RSS content and creates etree.XMLParser(strip_cdata=False) without explicitly disabling external entity resolution, external DTD loading, or network-backed entity lookup. The helper then parses untrusted XML bytes directly with etree.fromstring(...).

Record
CVE-2026-41895
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-611
Updated
2026-11-02
OSVGHSA-v7cp-2cx9-x793 8.2

changedetection.io project has an XXE vulnerability

changedetection.io_XXE_01 Vulnerability Report: We discovered a XXE vulnerability in the changedetection.io project

While analyzing the code logic, it was determined that an area may lead to unintended behavior under specific conditions. With the project's security in mind, see the analysis results to discern whether this may indicate a potential security risk.

Overview

  • SOURCE_VERSION: 0.54.9 (9f3a9fdc18bba404244801e5df8109e213ce9ff4)
  • Vulnerability type: XXE
  • Finding title: XML XPath helpers parse untrusted XML with entity resolution left to lxml defaults
  • Affected location: changedetectionio/html_tools.py:287

Root Cause

xpath_filter() switches to XML mode for XML/RSS content and creates etree.XMLParser(strip_cdata=False) without explicitly disabling external entity resolution, external DTD loading, or network-backed entity lookup. The helper then parses untrusted XML bytes directly with etree.fromstring(...).

Source-to-Sink Chain

  1. Untrusted XML/RSS response content is fetched from monitored URLs.
  2. Stream detection marks the content as XML/RSS and the include-filter path invokes xpath_filter(..., is_xml=True).
  3. xpath_filter() builds the default XML parser and calls etree.fromstring(...) at changedetectionio/html_tools.py:287.
  4. External entity declarations in attacker XML can be expanded by parser-default behavior in affected runtime combinations.

Exploitation Preconditions

  1. Attacker controls the watched XML/RSS response body.
  2. The watch uses an XPath include filter that triggers XML helper parsing.
  3. Runtime parser behavior allows external entity expansion (for example, vulnerable dependency/default combinations).
  4. The process can read the referenced local resource.

Risk

The XML helper path can turn watch processing into a local file disclosure primitive when entity expansion is enabled by parser defaults.

Impact

Sensitive local files can be exposed into extracted watch output, diff history, and downstream notification channels.

Remediation

  1. Harden XML parser construction with resolve_entities=False, load_dtd=False, and no_network=True.
  2. Reject DOCTYPE/entity declarations for untrusted XML if DTD features are unnecessary.
  3. Add regression tests that assert external entities are never expanded in XPath XML helper flows.
Record
GHSA-v7cp-2cx9-x793
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-611
Updated
2026-11-02
OSVPYSEC-2026-29 7.5

changedetection.io is a free open source web page change detection tool. In 0.54.9 and earlier, xpath_filter() switches to XML mode for XML/RSS content and creates etree.XMLParser(strip_cdata=False) without explicitly disabling external entity resolution, external DTD loading, or network-backed entity lookup. The helper then parses untrusted XML bytes directly with etree.fromstring(...).

Record
PYSEC-2026-29
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
changedetection-io
PyPI
 through 0.54.9 None known
changedetection-io
PyPI
 through 0.54.9, plus listed versions
0.38.20.390.39.10.39.100.39.10.post1
Show 45 moreShow less
0.39.10.post20.39.110.39.120.39.130.39.13.10.39.140.39.14.10.39.150.39.160.39.170.39.17.10.39.17.20.39.180.39.190.39.19.10.39.20.39.200.39.20.10.39.20.20.39.20.30.39.20.40.39.210.39.21.10.39.220.39.22.10.39.30.39.40.39.50.39.60.39.70.39.80.39.90.40.00.40.0.10.40.0.20.40.0.30.40.0.40.40.1.00.40.1.10.40.20.40.30.410.41.10.420.42.1
 None known
changedetection-io
PyPI
 before 0.54.10, plus listed versions
0.38.20.390.39.10.39.100.39.10.post1
Show 45 moreShow less
0.39.10.post20.39.110.39.120.39.130.39.13.10.39.140.39.14.10.39.150.39.160.39.170.39.17.10.39.17.20.39.180.39.190.39.19.10.39.20.39.200.39.20.10.39.20.20.39.20.30.39.20.40.39.210.39.21.10.39.220.39.22.10.39.30.39.40.39.50.39.60.39.70.39.80.39.90.40.00.40.0.10.40.0.20.40.0.30.40.0.40.40.1.00.40.1.10.40.20.40.30.410.41.10.420.42.1
0.54.10

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-41895 is a high vulnerability (CVSS 8.2) in Dgtlmoon Changedetection.io, published May 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 18th percentile. Fixed in changedetection-io 0.54.10.

References

This page doesn't list everything

Left out here: 289 versions. The JSON record has them.

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