CVE-2026-27696Public exploitNetwork attack vector

Internal service data disclosure via unvalidated watch URLs

Published Feb 25, 2026 · Updated Feb 25, 2026

SSRF in changedetection.io before 0.54.1 allows remote attackers to read internal service responses through crafted watch URLs. The is_safe_valid_url() function accepts URLs without resolving and rejecting private, loopback, or link-local addresses, and the fetcher stores returned content for web viewing. Network access to the web interface is sufficient when its default passwordless configuration remains in use; otherwise, authentication is required.

CVSS severity8.6
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in changedetection.io before 0.54.1 allows remote attackers to read internal service responses through crafted watch URLs. The is_safe_valid_url() function accepts URLs without resolving and rejecting private, loopback, or link-local addresses, and the fetcher stores returned content for web viewing. Network access to the web interface is sufficient when its default passwordless configuration remains in use; otherwise, authentication is required.

The record

CVE
CVE-2026-27696
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
changedetection.io
Product
changedetection.io
Classifications
CWE-918, T1552.005, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 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=< 0.54.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

changedetection.io · changedetection.ioversion=< 0.54.1

Published CVSS scores

8.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/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-918Server-Side Request Forgery (SSRF)
T1552.005Cloud Instance Metadata API
T1190Exploit Public-Facing Application

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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