Medium 6.1Published Feb 24, 2026

CVE-2026-27645changedetection.io Vulnerable to Reflected XSS in RSS Single Watch Error Response

Updated under an hour ago (Oct 26, 2026, 4:40 PM ET)

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It affects dgtlmoon changedetection.io and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for dgtlmoon changedetection.io

Exploited in the last 30 days

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.

CVSS: 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Feb 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

dgtlmoon changedetection.io dgtlmoon:changedetection.io (from the name)	before 0.54.1	CNA record
webtechnologies changedetection webtechnologies:changedetection	before 0.54.1	NVD

References

References

https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89w	x-refsource-confirm, exploit, vendor-advisory
https://github.com/dgtlmoon/changedetection.io/commit/a385c89abf44b52fcfa20c7c6a6dd3047c4c1eb5	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.