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Vulnerability record · CVE-2026-27696 · published 25 February 2026

CVE-2026-27696: Webtechnologies changedetection server-side request forgery (ssrf) vulnerability

Webtechnologies · Changedetection

changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, changedetection.io is vulnerable to Server-Side Request Forgery (SSRF) because the URL validation function `is_safe_valid_url()` does not validate the resolved IP address of watch URLs against private, loopback, or link-local address ranges. An authenticated user (or any user when no password is configured, which is the default) can add a watch for internal network URLs. The application fetches these URLs server-side, stores the response content, and makes it viewable through the web UI — enabling full data exfiltration from internal services. Version 0.54.1 contains a fix for the issue.

8.6 CVSS 3.1 High EPSS 0.48% · top 61.3% CWE-918 · Server-side request forgery (SSRF)
8.6CVSS 3.1 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

changedetection.io is a free open source web page change detection tool. In versions prior to 0.54.1, changedetection.io is vulnerable to Server-Side Request Forgery (SSRF) because the URL validation function `is_safe_valid_url()` does not validate the resolved IP address of watch URLs against private, loopback, or link-local address ranges. An authenticated user (or any user when no password is configured, which is the default) can add a watch for internal network URLs. The application fetches these URLs server-side, stores the response content, and makes it viewable through the web UI — enabling full data exfiltration from internal services. Version 0.54.1 contains a fix for the issue.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/dgtlmoon/changedetection.io/commit/fe7aa38c651d73fe5f41ce09855fa8f97193747b Patch
https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-3c45-4pj5-ch7m ExploitMitigationVendor Advisory
https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-3c45-4pj5-ch7m ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-35490Webtechnologies changedetection incorrect authorization vulnerabilitychangedetection.io is a free open source web page change detection tool. Prior to 0.54.8, the @login_optionally_required decorator is placed before (…EPSS 0.64%8.8CVE-2026-29065Webtechnologies changedetection path traversal vulnerabilitychangedetection.io is a free open source web page change detection tool. Prior to version 0.54.4, a Zip Slip vulnerability in the backup restore func…EPSS 0.56%8.8CVE-2026-29039Webtechnologies changedetection code injection vulnerabilitychangedetection.io is a free open source web page change detection tool. Prior to version 0.54.4, the changedetection.io application allows users to …EPSS 0.51%8.3CVE-2026-33981Webtechnologies changedetection information exposure vulnerabilitychangedetection.io is a free open source web page change detection tool. Prior to 0.54.7, the `jq:` and `jqraw:` include filter expressions allow use…EPSS 0.48%8.2CVE-2026-41895Webtechnologies changedetection xml external entity (xxe) vulnerabilitychangedetection.io is a free open source web page change detection tool. In 0.54.9 and earlier, xpath_filter() switches to XML mode for XML/RSS conte…EPSS 0.37%7.5CVE-2026-43891Webtechnologies changedetection vulnerabilitychangedetection.io is a free open source web page change detection tool. Prior to 0.55.1, the vulnerability is caused by trusting attacker-controlled…EPSS 0.50%7.1CVE-2026-35000Webtechnologies changedetection vulnerabilityChangeDetection.io versions prior to 0.54.7 contain a protection bypass vulnerability in the SafeXPath3Parser implementation that allows attackers to…EPSS 0.47%6.1CVE-2026-29038Webtechnologies changedetection cross-site scripting vulnerabilitychangedetection.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) vul…EPSS 0.34%

Source: NIST National Vulnerability Database (record CVE-2026-27696), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.