CVE-2026-44515Network attack vector

Authenticated blind SSRF via unvalidated feed URL

Published May 14, 2026 · Updated May 14, 2026

SSRF in Nextcloud News before 28.3.0-beta.1 allows remote authenticated users to probe internal services through crafted feed URLs. The web and API feed-creation path accepts a user-supplied URL and makes an outbound request without blocking private IP ranges or localhost. Any authenticated account that can add a feed can infer internal-service reachability and behavior from timing and application behavior, but the response body is not returned.

CVSS severity2.3
Low
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Nextcloud News before 28.3.0-beta.1 allows remote authenticated users to probe internal services through crafted feed URLs. The web and API feed-creation path accepts a user-supplied URL and makes an outbound request without blocking private IP ranges or localhost. Any authenticated account that can add a feed can infer internal-service reachability and behavior from timing and application behavior, but the response body is not returned.

The record

CVE
CVE-2026-44515
Published
May 14, 2026
Updated
May 14, 2026
Vendor
Nextcloud GmbH
Product
News
Classifications
CWE-918, CAPEC-664, T1046
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 14, 2026CVE publishedPublication date reported by the CVE source.
  2. May 14, 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=< 28.3.0-beta.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Newsversion=< 28.3.0-beta.1

Published CVSS scores

2.3GitHub, Inc.CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1046Network Service Discovery

Public exploit references

No public exploit references are available in this record.

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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