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Server-Side Request Forgery (SSRF)Weakness · CWE-918

CVE-2026-56771

HIGH · 8.5 CVSS v3.1 Published 2026-06-25
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
91/100
Remediation priority · Urgent
Remotely reachable Zero-click Patch available 8 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
NewsBlur before version 14.5.0 contains a server-side request forgery vulnerability in the add_url endpoint that allows authenticated users to make arbitrary server requests to internal networks by failing to filter private IP addresses. Attackers can exploit this to access localhost services and cloud metadata endpoints, enabling internal network scanning and sensitive data exfiltration.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-918

The server can be induced to make requests to a URL an attacker controls, turning it into a proxy into internal networks and cloud metadata services. It's especially dangerous behind a trusted network boundary. The fix is strict allow-listing of destinations and blocking access to internal address ranges.

General guidance for the server-side request forgery (ssrf) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
None

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix High confidence

14.5.0

  1. 1. Identify the currently running NewsBlur version by checking the deployment or configuration
  2. 2. Confirm the current version is below 14.5.0 (any version before 14.5.0 is vulnerable)
  3. 3. Review the NewsBlur upgrade documentation for your deployment method (pip, Docker, manual, etc.)
  4. 4. Create a backup of the current NewsBlur installation and database
  5. 5. Perform the upgrade to version 14.5.0 or later using the appropriate method (e.g., pip install --upgrade newsblur, docker pull, or git pull for source installations)
  6. 6. Verify the upgrade completed successfully by checking the version number
  7. 7. Test the add_url endpoint functionality to ensure it works correctly post-upgrade
  8. 8. Confirm the SSRF fix is applied by reviewing the patched code at the GitHub commit (2e6c6812c94f35a731bda864de5aef39f18307f1) which adds private IP address filtering

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-56771 in production — separate from our analysis above.

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