What’s Vulnerable › Vulnerabilities

CVE-2026-29038: changedetection.io: Reflected XSS in RSS Tag Error Response

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-06 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• dgtlmoon changedetection.io: before 0.54.4 — fixed in 0.54.4

How to fix

Upgrade to a fixed version: dgtlmoon changedetection.io 0.54.4. Check the vendor advisory for mitigations.

References

• https://github.com/dgtlmoon/changedetection.io/commit/ec7d56f85d1e9690fca7cb4711c1fb20dffec780
• https://github.com/dgtlmoon/changedetection.io/releases/tag/0.54.4
• https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-8whx-v8qq-pq64

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