CVE-2026-27645

Name: CVE-2026-27645
Creator: NVD / NIST
Published: 2026-02-25T05:17:26.317+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.45%

Last modified Jun 17, 2026

CVE-2026-27645 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.45%

35.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Webtechnologies	Changedetection	< 0.54.1

References

https://github.com/dgtlmoon/changedetection.io/commit/a385c89abf44b52fcfa20c7c6a6dd3047c4c1eb5Patch
https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89wExploit, Vendor Advisory
https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-mw8m-398g-h89wExploit, Vendor Advisory

Timeline

Published: Feb 25, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-27645?

How severe is CVE-2026-27645?

CVE-2026-27645 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.

How do I fix CVE-2026-27645?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-27645?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST