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TI-2026-22027 Aliases CVE-2026-27645GHSA-mw8m-398g-h89w

changedetection.io Vulnerable to Reflected XSS in RSS Single Watch Error Response

Priority MEDIUM 60CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, the RSS single-watch endpoint reflects the UUID path parameter directly in the HTTP response body without HTML escaping. Since Flask returns text/html by default for plain string responses, the browser parses and executes injected JavaScript. Version 0.54.1 contains a fix for the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00495 42nd percentileScored 2026-11-08
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed changedetection.io (dgtlmoon): 0.54.1changedetection.io (PyPI): 0.53.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
dgtlmoonchangedetection.iobefore 0.54.10.54.1Patch availableCNA
—changedetection.io (PyPI)before 0.53.70.53.7Patch availableGHSA-mw8m-398g-h89w
  • changedetection.io Vendordgtlmoon Affected before 0.54.1 Fixed in 0.54.1 Patch available CNA
  • changedetection.io (PyPI) Vendor— Affected before 0.53.7 Fixed in 0.53.7 Patch available GHSA-mw8m-398g-h89w

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:webtechnologies:changedetection:*:*:*:*:*:*:*:*before 0.54.1Vulnerabledgtlmoon
  • cpe:2.3:a:webtechnologies:changedetection:*:*:*:*:*:*:*:* Versions before 0.54.1 Vulnerable ·dgtlmoon

Remediation

  • Fix · CNA changedetection.io (dgtlmoon) Fixed in 0.54.1
  • Fix · GHSA-mw8m-398g-h89w changedetection.io (PyPI) Fixed in 0.53.7 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27645
  2. 2026-10-03 Alias added: GHSA-mw8m-398g-h89w

References

Exploit 1

Patch 1

Advisory 1

Other 1

  • TI-2026-27619 changedetection.io has an Authentication Bypass via Decorator Ordering CVSS 3.1CRITICAL 9.8
  • TI-2026-23210 changedetection.io: Zip Slip vulnerability in the backup restore functionality CVSS 4.0HIGH 8.8
  • TI-2026-22073 changedetection.io Vulnerable to Server-Side Request Forgery (SSRF) via Watch URLs CVSS 3.1HIGH 8.6
  • TI-2026-26322 Changedetection.io Discloses Environment Variables via jq env Builtin in Include Filters CVSS 4.0HIGH 8.3
  • TI-2026-23185 changedetection.io: XPath - Arbitrary File Read via unparsed-text() CVSS 4.0HIGH 8.8
  • TI-2026-31955 changedetection.io: Arbitrary Local File Read via crafted backup restore CVSS 3.1HIGH 7.5
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences