PT-2026-21867 · Unknown · Changedetection.Io

Route2Shell · Published 2026-02-25 · Updated 2026-03-02 · CVE-2026-27696

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

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

Name of the Vulnerable Software and Affected Versions changedetection.io versions prior to 0.54.1

Description changedetection.io is a web page change detection tool susceptible to Server-Side Request Forgery (SSRF). The is safe valid url() function does not properly 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, can add a watch for internal network URLs. The application then fetches these URLs server-side, stores the content, and makes it accessible through the web interface, potentially allowing full data exfiltration from internal services.

Recommendations Update to version 0.54.1 or later to address this vulnerability.

Exploit

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-27696

GHSA-3C45-4PJ5-CH7M

Affected Products

Changedetection.Io

References · 15

• 🔥 https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-3c45-4pj5-ch7m · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27696.json · Exploit
• https://github.com/dgtlmoon/changedetection.io/commit/fe7aa38c651d73fe5f41ce09855fa8f97193747b · Patch
• https://osv.dev/vulnerability/GHSA-3c45-4pj5-ch7m · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-27696 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-27696 · Security Note
• https://github.com/dgtlmoon/changedetection.io · Note
• https://twitter.com/CveTodo/status/2026529759715311898 · Twitter Post
• https://twitter.com/CVEnew/status/2026641342382653470 · Twitter Post
• https://twitter.com/cracbot/status/2028425219753582696 · Twitter Post
• https://twitter.com/CveFindCom/status/2026532937693352013 · Twitter Post
• https://twitter.com/chs/status/2027455991428575516 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2026699091074335154 · Twitter Post
• https://t.me/CVEtracker/45695 · Telegram Post
• https://t.me/cveNotify/153104 · Telegram Post