CVE-2026-27645

MEDIUM NUCLEI

changedetection.io < 0.54.1 - Reflected Cross-Site Scripting via RSS Single-Watch UUID Parameter

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2026-27645 has a Nuclei detection template available — see the Nuclei card below for the Shodan/FOFA recon queries.

Description

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.

Nuclei Templates (1)

Changedetection.io RSS Single Watch - Cross-Site Scripting
MEDIUMVERIFIEDby 0x_Akoko
Shodan: http.title:"Change Detection"
FOFA: title="Change Detection"

References (2)

Core 2

Scores

CVSS v3 6.1
EPSS 0.0072
EPSS Percentile 72.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
pypi/changedetection.io 0 - 0.53.7PyPI
webtechnologies/changedetection < 0.54.1
Published Feb 25, 2026
Tracked Since Feb 25, 2026