CVE-2026-29038Public exploitNetwork attack vector

Reflected XSS via unescaped RSS tag identifier

Published Mar 6, 2026 · Updated Mar 6, 2026

Reflected XSS in dgtlmoon changedetection.io before 0.54.4 allows remote attackers to execute JavaScript via a crafted RSS tag URL. The tag.py error path inserts the tag_uuid path value into a plain Flask string response without HTML escaping, causing an HTML content type. Exploitation requires a valid RSS token and victim navigation to the crafted URL, after which script runs in the application's origin and can access session-scoped data.

CVSS severity6.1
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in dgtlmoon changedetection.io before 0.54.4 allows remote attackers to execute JavaScript via a crafted RSS tag URL. The tag.py error path inserts the tag_uuid path value into a plain Flask string response without HTML escaping, causing an HTML content type. Exploitation requires a valid RSS token and victim navigation to the crafted URL, after which script runs in the application's origin and can access session-scoped data.

The record

CVE
CVE-2026-29038
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
changedetection.io
Product
changedetection.io
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.54.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

changedetection.io · changedetection.ioversion=< 0.54.4

Published CVSS scores

6.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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