Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M

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

Medium 6.1

In plain English

A medium-severity cross-site scripting in changedetection.io from dgtlmoon. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium

Exploit odds (30 days)0.3%top 75.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	changedetection-io	0.54.4	GHSA-8whx-v8qq-pq64
PyPI	changedetection-io	0.54.4	PYSEC-2026-2127

Affected products (as reported)

Vendor	Product	Versions
dgtlmoon	changedetection.io	< 0.54.4

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

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