XSS in Dgtlmoon Changedetection.io
CVE-2026-29038
changedetection.io is a free open source web page change detection tool. Prior to version 0.54.4, there is a reflected cross-site scripting (XSS) vulnerability identified in the /rss/tag/ endpoint of changedetection.io. The tag_uuid path parameter is reflected 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. This issue has been patched in version 0.54.4.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
- Dgtlmoon Changedetection.io — versions < 0.54.4
- Webtechnologies Changedetection
Weakness classification (CWE)
References
- github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8whx-v8qq-pq64 (Exploit, Mitigation, Vendor Advisory)
- github.com/dgtlmoon/changedetection.io/commit/ec7d56f85d1e9690fca7cb4711c1fb20d… (Patch)
- github.com/dgtlmoon/changedetection.io/releases/tag/0.54.4 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-29038?
- CVE-2026-29038 is a medium-severity vulnerability in Dgtlmoon Changedetection.io, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-06.
- How severe is CVE-2026-29038?
- Medium severity. CVSS v3 base score is 6.1 out of 10.