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Medium, CVSS 5.3amended

changedetection.io is vulnerable to unauthenticated static path traversal

CVE-2026-25527GHSA-9jj8-v89v-xjvw

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (changedetection-io 0.53.2), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS
  • CVE-2026-25527: 1.03% estimated exploitation activity in the next 30 days; percentile 63.63 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary The /static/<group/<filename route accepts group="..", which causes sendfromdirectory("static/..", filename) to execute. This moves the base directory up to /app/changedetectionio, enabling unauthenticated local file read of application source files (e.g., flaskapp.py). Severity is low information disclosure (C:L). Details The vulnerable code is in changedetectionio/flaskapp.py inside staticcontent(): The group sanitization allows dots, so group=".." passes validation. This results in sendfromdirectory("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…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-9jj8-v89v-xjvw

  2. Revision 1 · created ·

    Published from osv record GHSA-9jj8-v89v-xjvw

Agent brief

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# Patch Next advisory brief: CVE-2026-25527

Advisory: changedetection.io is vulnerable to unauthenticated static path traversal
IDs: CVE-2026-25527, GHSA-9jj8-v89v-xjvw
Record: https://patchnext.com/advisories/cve-2026-25527 (revision 2, source checked 26 Oct 2026, 13:49 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: changedetection-io 0.53.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI changedetection-io: affected < 0.53.2; fixed in 0.53.2

## Suggested inspection (read-only)
- `python -m pip show changedetection-io`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on changedetection-io.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-9jj8-v89v-xjvw (OSV record GHSA-9jj8-v89v-xjvw lists affected ranges: PyPI changedetection-io >=0 <0.53.2 (fixed))
- Verified: https://github.com/advisories/GHSA-9jj8-v89v-xjvw (GitHub-reviewed advisory GHSA-9jj8-v89v-xjvw lists affected ranges: PyPI changedetection-io >=0 <0.53.2)

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