CVE-2026-41895 (GCVE-0-2026-41895)

Vulnerability from cvelistv5 – Published: 2026-05-12 16:52 – Updated: 2026-05-18 15:10

Title

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

Summary

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(...).

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-18 15:09 UTC

CWE

CWE-611 - Improper Restriction of XML External Entity Reference

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7610 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/dgtlmoon/changedetection.io/se…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
dgtlmoon	changedetection.io	Affected: <= 0.54.9	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-41895

Vulnerability from fkie_nvd - Published: 2026-05-12 18:17 - Updated: 2026-06-17 10:47

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-v7cp-2cx9-x793	Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	webtechnologies	changedetection	*

JSON

To clipboard

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GHSA-V7CP-2CX9-X793

Vulnerability from github – Published: 2026-05-04 20:56 – Updated: 2026-06-05 14:31

Summary

changedetection.io project has an XXE vulnerability

Details

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

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

Exploitation Preconditions

Attacker controls the watched XML/RSS response body.
The watch uses an XPath include filter that triggers XML helper parsing.
Runtime parser behavior allows external entity expansion (for example, vulnerable dependency/default combinations).
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

Harden XML parser construction with resolve_entities=False, load_dtd=False, and no_network=True.
Reject DOCTYPE/entity declarations for untrusted XML if DTD features are unnecessary.
Add regression tests that assert external entities are never expanded in XPath XML helper flows.

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

8.2 (High)


                  
                    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "changedetection.io"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.54.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41895"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-04T20:56:36Z",
    "nvd_published_at": "2026-05-12T18:17:23Z",
    "severity": "HIGH"
  },
  "details": "# changedetection.io_XXE_01 Vulnerability Report: We discovered a XXE vulnerability in the changedetection.io project\n\nWhile analyzing the code logic, it was determined that an area may lead to unintended behavior under specific conditions. With the project\u0027s security in mind, see the analysis results to discern whether this may indicate a potential security risk.\n\n## Overview\n- SOURCE_VERSION: `0.54.9 (9f3a9fdc18bba404244801e5df8109e213ce9ff4)`\n- Vulnerability type: `XXE`\n- Finding title: `XML XPath helpers parse untrusted XML with entity resolution left to lxml defaults`\n- Affected location: `changedetectionio/html_tools.py:287`\n\n## Root Cause\n`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(...)`.\n\n## Source-to-Sink Chain\n1. Untrusted XML/RSS response content is fetched from monitored URLs.\n2. Stream detection marks the content as XML/RSS and the include-filter path invokes `xpath_filter(..., is_xml=True)`.\n3. `xpath_filter()` builds the default XML parser and calls `etree.fromstring(...)` at `changedetectionio/html_tools.py:287`.\n4. External entity declarations in attacker XML can be expanded by parser-default behavior in affected runtime combinations.\n\n## Exploitation Preconditions\n1. Attacker controls the watched XML/RSS response body.\n2. The watch uses an XPath include filter that triggers XML helper parsing.\n3. Runtime parser behavior allows external entity expansion (for example, vulnerable dependency/default combinations).\n4. The process can read the referenced local resource.\n\n## Risk\nThe XML helper path can turn watch processing into a local file disclosure primitive when entity expansion is enabled by parser defaults.\n\n## Impact\nSensitive local files can be exposed into extracted watch output, diff history, and downstream notification channels.\n\n## Remediation\n1. Harden XML parser construction with `resolve_entities=False`, `load_dtd=False`, and `no_network=True`.\n2. Reject `DOCTYPE`/entity declarations for untrusted XML if DTD features are unnecessary.\n3. Add regression tests that assert external entities are never expanded in XPath XML helper flows.",
  "id": "GHSA-v7cp-2cx9-x793",
  "modified": "2026-06-05T14:31:13Z",
  "published": "2026-05-04T20:56:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-v7cp-2cx9-x793"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41895"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dgtlmoon/changedetection.io"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/changedetection-io/PYSEC-2026-29.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "changedetection.io project has an XXE vulnerability"
}

PYSEC-2026-29

Vulnerability from pysec - Published: 2026-05-12 18:17 - Updated: 2026-05-20 09:18

Details

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Impacted products

Name	purl
changedetection-io	pkg:pypi/changedetection-io

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "changedetection-io",
        "purl": "pkg:pypi/changedetection-io"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.54.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.38.2",
        "0.39",
        "0.39.1",
        "0.39.10",
        "0.39.10.post1",
        "0.39.10.post2",
        "0.39.11",
        "0.39.12",
        "0.39.13",
        "0.39.13.1",
        "0.39.14",
        "0.39.14.1",
        "0.39.15",
        "0.39.16",
        "0.39.17",
        "0.39.17.1",
        "0.39.17.2",
        "0.39.18",
        "0.39.19",
        "0.39.19.1",
        "0.39.2",
        "0.39.20",
        "0.39.20.1",
        "0.39.20.2",
        "0.39.20.3",
        "0.39.20.4",
        "0.39.21",
        "0.39.21.1",
        "0.39.22",
        "0.39.22.1",
        "0.39.3",
        "0.39.4",
        "0.39.5",
        "0.39.6",
        "0.39.7",
        "0.39.8",
        "0.39.9",
        "0.40.0",
        "0.40.0.1",
        "0.40.0.2",
        "0.40.0.3",
        "0.40.0.4",
        "0.40.1.0",
        "0.40.1.1",
        "0.40.2",
        "0.40.3",
        "0.41",
        "0.41.1",
        "0.42",
        "0.42.1",
        "0.42.2",
        "0.42.3",
        "0.43.1",
        "0.43.2",
        "0.44",
        "0.44.1",
        "0.45",
        "0.45.1",
        "0.45.11",
        "0.45.12",
        "0.45.13",
        "0.45.14",
        "0.45.15",
        "0.45.16",
        "0.45.17",
        "0.45.18",
        "0.45.19",
        "0.45.2",
        "0.45.20",
        "0.45.21",
        "0.45.22",
        "0.45.23",
        "0.45.24",
        "0.45.25",
        "0.45.26",
        "0.45.3",
        "0.45.4",
        "0.45.5",
        "0.45.6",
        "0.45.7",
        "0.45.7.1",
        "0.45.7.2",
        "0.45.7.3",
        "0.45.8",
        "0.45.8.1",
        "0.45.9",
        "0.46.0",
        "0.46.1",
        "0.46.2",
        "0.46.3",
        "0.46.4",
        "0.47.0",
        "0.47.1",
        "0.47.2",
        "0.47.3",
        "0.47.4",
        "0.47.5",
        "0.47.6",
        "0.48.0",
        "0.48.1",
        "0.48.2",
        "0.48.3",
        "0.48.4",
        "0.48.5",
        "0.48.6",
        "0.49.0",
        "0.49.1",
        "0.49.10",
        "0.49.12",
        "0.49.13",
        "0.49.14",
        "0.49.15",
        "0.49.16",
        "0.49.17",
        "0.49.18",
        "0.49.2",
        "0.49.3",
        "0.49.4",
        "0.49.5",
        "0.49.6",
        "0.49.7",
        "0.49.8",
        "0.49.9",
        "0.50.1",
        "0.50.10",
        "0.50.11",
        "0.50.12",
        "0.50.13",
        "0.50.14",
        "0.50.15",
        "0.50.16",
        "0.50.17",
        "0.50.18",
        "0.50.19",
        "0.50.2",
        "0.50.20",
        "0.50.21",
        "0.50.22",
        "0.50.23",
        "0.50.24",
        "0.50.25",
        "0.50.26",
        "0.50.27",
        "0.50.28",
        "0.50.29",
        "0.50.3",
        "0.50.30",
        "0.50.31",
        "0.50.32",
        "0.50.33",
        "0.50.34",
        "0.50.35",
        "0.50.37",
        "0.50.38",
        "0.50.39",
        "0.50.4",
        "0.50.40",
        "0.50.41",
        "0.50.42",
        "0.50.43",
        "0.50.5",
        "0.50.6",
        "0.50.7",
        "0.50.8",
        "0.50.9",
        "0.51.0",
        "0.51.1",
        "0.51.2",
        "0.51.3",
        "0.51.4",
        "0.52.1",
        "0.52.2",
        "0.52.3",
        "0.52.4",
        "0.52.5",
        "0.52.6",
        "0.52.7",
        "0.52.8",
        "0.52.9",
        "0.53.1",
        "0.53.2",
        "0.53.3",
        "0.53.4",
        "0.53.5",
        "0.53.6",
        "0.53.7",
        "0.54.1",
        "0.54.2",
        "0.54.3",
        "0.54.4",
        "0.54.5",
        "0.54.6",
        "0.54.7",
        "0.54.8",
        "0.54.9"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41895",
    "GHSA-v7cp-2cx9-x793"
  ],
  "details": "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(...).",
  "id": "PYSEC-2026-29",
  "modified": "2026-05-20T09:18:54.415978Z",
  "published": "2026-05-12T18:17:23.493Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-v7cp-2cx9-x793"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-41895 (GCVE-0-2026-41895)

FKIE_CVE-2026-41895

GHSA-V7CP-2CX9-X793

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

Overview

Root Cause

Source-to-Sink Chain

Exploitation Preconditions

Risk

Impact

Remediation

PYSEC-2026-29

Tags

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Nomenclature

Vulnerability timeline

Related by attack behaviour