Vulnerability-Lookup

CVE-2026-25527 (GCVE-0-2026-25527)

Vulnerability from cvelistv5 – Published: 2026-02-19 14:18 – Updated: 2026-02-19 15:35

Title

changedetection.io vulnerable to unauthenticated static path traversal

Summary

changedetection.io is a free open source web page change detection tool. In versions prior to 0.53.2, the `/static/<group>/<filename>` route accepts `group=".."`, which causes `send_from_directory("static/..", filename)` to execute. This moves the base directory up to `/app/changedetectionio`, enabling unauthenticated local file read of application source files (e.g., `flask_app.py`). Version 0.53.2 fixes the issue.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-19 15:34 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root

References

2 references

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

Impacted products

1 product

Vendor	Product	Version	CPE status
dgtlmoon	changedetection.io	Affected: < 0.53.2	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-25527

Vulnerability from fkie_nvd - Published: 2026-02-19 15:16 - Updated: 2026-06-17 10:24

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/dgtlmoon/changedetection.io/commit/9d38b4517364831889b5b0d7b3465fd060403fd4	Patch
	security-advisories@github.com	https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-9jj8-v89v-xjvw	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	webtechnologies	changedetection	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "changedetection.io",
          "vendor": "dgtlmoon",
          "versions": [
            {
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    },
    {
      "lang": "es",
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GHSA-9JJ8-V89V-XJVW

Vulnerability from github – Published: 2026-07-20 19:06 – Updated: 2026-07-20 19:06

Summary

changedetection.io is vulnerable to unauthenticated static path traversal

Details

Summary

The /static/<group>/<filename> route accepts group="..", which causes send_from_directory("static/..", filename) to execute. This moves the base directory up to /app/changedetectionio, enabling unauthenticated local file read of application source files (e.g., flask_app.py). Severity is low information disclosure (C:L).

Details

The vulnerable code is in changedetectionio/flask_app.py inside static_content():

group = re.sub(r'[^\w.-]+', '', group.lower())
filename = re.sub(r'[^\w.-]+', '', filename.lower())
...
return send_from_directory(f"static/{group}", path=filename)

The group sanitization allows dots, so group=".." passes validation.
This results in send_from_directory("static/..", filename), effectively shifting the base directory to /app/changedetectionio and allowing reads of files in that directory.
The route is unauthenticated, so any user can retrieve source files without logging in.

Limitation: the route only matches /static/<group>/<filename> and rejects slashes inside filename, so it cannot traverse further to arbitrary system paths like /etc/passwd. It is limited to files inside the application package directory.

PoC

1) Start an instance (example: Docker on port 5050)

docker run -d --name cdio -p 127.0.0.1:5050:5000 -v cdio-data:/datastore cdio-local

2) Reproduce
(URL-encoded traversal)

curl -i http://127.0.0.1:5050/static/%2e%2e/flask_app.py

(curl path passthrough)

curl --path-as-is -i http://127.0.0.1:5050/static/../flask_app.py

3) Observe that the response body contains Python source code from flask_app.py.

Impact

Vulnerability type: Directory Traversal / Local File Read
Affected users: Anyone with network access (no authentication required)
Scope: Source files under /app/changedetectionio
Security impact: Internal logic exposure can aid further exploitation (Confidentiality: Low)

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

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        "name": "changedetection.io"
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  "aliases": [
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  ],
  "database_specific": {
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      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-20T19:06:55Z",
    "nvd_published_at": "2026-02-19T15:16:11Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\nThe `/static/\u003cgroup\u003e/\u003cfilename\u003e` route accepts `group=\"..\"`, which causes `send_from_directory(\"static/..\", filename)` to execute. This moves the base directory up to `/app/changedetectionio`, enabling **unauthenticated local file read** of application source files (e.g., `flask_app.py`). Severity is **low information disclosure (C:L)**.\n\n### Details\nThe vulnerable code is in `changedetectionio/flask_app.py` inside `static_content()`:\n\n```\ngroup = re.sub(r\u0027[^\\w.-]+\u0027, \u0027\u0027, group.lower())\nfilename = re.sub(r\u0027[^\\w.-]+\u0027, \u0027\u0027, filename.lower())\n...\nreturn send_from_directory(f\"static/{group}\", path=filename)\n```\n\nThe `group` sanitization allows dots, so `group=\"..\"` passes validation.  \nThis results in `send_from_directory(\"static/..\", filename)`, effectively shifting the base directory to `/app/changedetectionio` and allowing reads of files in that directory.  \nThe route is unauthenticated, so **any user can retrieve source files** without logging in.\n\n\u003e Limitation: the route only matches `/static/\u003cgroup\u003e/\u003cfilename\u003e` and rejects slashes inside `filename`, so it cannot traverse further to arbitrary system paths like `/etc/passwd`. It is limited to files inside the application package directory.\n\n### PoC\n1) Start an instance (example: Docker on port 5050)\n```\ndocker run -d --name cdio -p 127.0.0.1:5050:5000 -v cdio-data:/datastore cdio-local\n```\n\n2) Reproduce  \n**(URL-encoded traversal)**\n```\ncurl -i http://127.0.0.1:5050/static/%2e%2e/flask_app.py\n```\n\n**(curl path passthrough)**\n```\ncurl --path-as-is -i http://127.0.0.1:5050/static/../flask_app.py\n```\n\n3) Observe that the response body contains Python source code from `flask_app.py`.\n\n### Impact\n- **Vulnerability type:** Directory Traversal / Local File Read\n- **Affected users:** Anyone with network access (no authentication required)\n- **Scope:** Source files under `/app/changedetectionio`\n- **Security impact:** Internal logic exposure can aid further exploitation (Confidentiality: Low)",
  "id": "GHSA-9jj8-v89v-xjvw",
  "modified": "2026-07-20T19:06:55Z",
  "published": "2026-07-20T19:06:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-9jj8-v89v-xjvw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25527"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dgtlmoon/changedetection.io/commit/9d38b4517364831889b5b0d7b3465fd060403fd4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dgtlmoon/changedetection.io"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/changedetection-io/PYSEC-2026-2124.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "changedetection.io is vulnerable to unauthenticated static path traversal"
}

PYSEC-2026-2124

Vulnerability from pysec - Published: 2026-02-19 15:16 - Updated: 2026-07-13 05:48

Details

changedetection.io is a free open source web page change detection tool. In versions prior to 0.53.2, the /static/<group>/<filename> route accepts group="..", which causes send_from_directory("static/..", filename) to execute. This moves the base directory up to /app/changedetectionio, enabling unauthenticated local file read of application source files (e.g., flask_app.py). Version 0.53.2 fixes the issue.

Severity

5.3 (Medium)


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

Impacted products

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

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "changedetection-io",
        "purl": "pkg:pypi/changedetection-io"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.53.2"
            }
          ],
          "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"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25527",
    "GHSA-9jj8-v89v-xjvw"
  ],
  "details": "changedetection.io is a free open source web page change detection tool. In versions prior to 0.53.2, the `/static/\u003cgroup\u003e/\u003cfilename\u003e` route accepts `group=\"..\"`, which causes `send_from_directory(\"static/..\", filename)` to execute. This moves the base directory up to `/app/changedetectionio`, enabling unauthenticated local file read of application source files (e.g., `flask_app.py`). Version 0.53.2 fixes the issue.",
  "id": "PYSEC-2026-2124",
  "modified": "2026-07-13T05:48:11.793673Z",
  "published": "2026-02-19T15:16:11.947Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/dgtlmoon/changedetection.io/commit/9d38b4517364831889b5b0d7b3465fd060403fd4"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-9jj8-v89v-xjvw"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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.

Detection rules are retrieved from Rulezet.

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.

Related by attack behaviour

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-2026-25527 (GCVE-0-2026-25527)

FKIE_CVE-2026-25527

GHSA-9JJ8-V89V-XJVW

Summary

Details

PoC

Impact

PYSEC-2026-2124

Tags

Sightings

Nomenclature

Related by attack behaviour