changedetection.io vulnerable to stored XSS in Watch update via API
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
changedetection.io is a free open source web page change detection tool. A Stored Cross Site Scripting is present in changedetection.io Watch update API in versions prior to 0.50.34 due to insufficient security checks. Two scenarios are possible. In the first, an attacker can insert a new watch with an arbitrary URL which really points to a web page. Once the HTML content is retrieved, the attacker updates the URL with a JavaScript payload. In the second, an attacker substitutes the URL in an existing watch with a new URL that is in reality a JavaScript payload. When the user clicks on *Preview* and then on the malicious link, the JavaScript malicious code is executed. Version 0.50.34 fixes the issue.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| dgtlmoon | changedetection.io | before 0.50.34 | 0.50.34 | Patch available | CNA |
| — | changedetection.io (PyPI) | before 0.50.34 | 0.50.34 | Patch available | GHSA-4c3j-3h7v-22q9 |
- changedetection.io Vendordgtlmoon Affected before 0.50.34 Fixed in 0.50.34 Patch available CNA
- changedetection.io (PyPI) Vendor— Affected before 0.50.34 Fixed in 0.50.34 Patch available GHSA-4c3j-3h7v-22q9
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:changedetection:changedetection:*:*:*:*:*:*:*:* | before 0.50.34 | Vulnerable | Changedetection |
- cpe:2.3:a:changedetection:changedetection:*:*:*:*:*:*:*:* Versions before 0.50.34 Vulnerable ·Changedetection
Remediation
- Fix · CNA changedetection.io (dgtlmoon) Fixed in 0.50.34
- Fix · GHSA-4c3j-3h7v-22q9 changedetection.io (PyPI) Fixed in 0.50.34 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-62780
- 2026-10-03 Alias added: GHSA-4c3j-3h7v-22q9
References
Other 5
- https://github.com/dgtlmoon/changedetection.io/issues/3562
- https://github.com/dgtlmoon/changedetection.io/pull/3564
- https://github.com/dgtlmoon/changedetection.io
- https://github.com/dgtlmoon/changedetection.io/releases/tag/0.50.34
- https://github.com/pypa/advisory-database/tree/main/vulns/changedetection-io/PYSEC-2025-91.yaml
More dgtlmoon vulnerabilities
- TI-2024-21533 Server Side Template Injection in Jinja2 allows Remote Command Execution CVSS 3.1CRITICAL 10.0
- TI-2026-27619 changedetection.io has an Authentication Bypass via Decorator Ordering CVSS 3.1CRITICAL 9.8
- TI-2026-23210 changedetection.io: Zip Slip vulnerability in the backup restore functionality CVSS 4.0HIGH 8.8
- TI-2026-62554 changedetection.io through 0.60.6 SSRF via browser-step Goto URL CVSS 4.0HIGH 8.7
- TI-2026-22073 changedetection.io Vulnerable to Server-Side Request Forgery (SSRF) via Watch URLs CVSS 3.1HIGH 8.6
- TI-2024-37396 changedetection.io has Improper Input Validation Leading to LFR/Path Traversal CVSS 3.1HIGH 8.6
Sources
- CVE-2025-62780 · CVE Program
- CVE-2025-62780 · NVD
- FIRST EPSS
- GHSA-4c3j-3h7v-22q9 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences