CVE-2026-56771: NewsBlur < 14.5.0 - Server-Side Request Forgery via add_url Endpoint
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by VulnCheck, published 2026-06-25).
Weakness: Server-Side Request Forgery (SSRF)
How it can be exploited
Exploitable over the network with low attack complexity with no special attack requirements needing low privileges and no user interaction. Impact: confidentiality none, integrity low, availability none. CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:N/SA:N
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: partial.
Public exploit evidence (Exploit Observer)
Also known as: EUVD-2026-39524, GHSA-hggv-jxwf-w664
VEDAS cluster: VEDAS:CYBERCAPTAIN
Exploit Observer links 3 pieces of public exploit code or detection modules that name this CVE or one of its aliases.
Exploit code and modules (3)
Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.
- Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2026/CVE-2026-56771.rules
- Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2026/CVE-2026-56771.rules
- Code repository: https://raw.githubusercontent.com/ARPSyndicate/vedas-signatures/main/suricata/2026/CVE-2026-56771.rules
Vulnerability databases and vendor advisories (3)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-39524
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-hggv-jxwf-w664
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-56771
3 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.004
low predicted chance of attack - VEDAS
- 0.987
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- Suricata
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| samuelclay NewsBlur | before 14.5.0 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
Fixed versions stated in the CVE record: 14.5.0.
Vendor guidance:
- Release Notes (release-notes)
- Patch Commit (1) (patch)
- Patch Commit (2) (patch)
How to detect it
Suricata rules (network detection)
1 rule that alert on traffic matching this exploit: VEDAS CVE-2026-56771 NewsBlur - Server-Side Request Forgery via add_url. Add them to your Suricata rule set and reload.
Show the rules
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2026-56771 NewsBlur - Server-Side Request Forgery via add_url"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/reader/add_url"; nocase; fast_pattern; http.request_body; content:"url"; nocase; pcre:"/https?(?:\x3a|%3a)(?:\x2f\x2f|%2f%2f)(?:127\.|0\.0\.0\.0|localhost|169\.254\.169\.254|metadata|10\.|192\.168\.|172\.(?:1[6-9]|2[0-9]|3[01])\.|\x5b|%5b)/i"; classtype:web-application-attack; reference:cve,CVE-2026-56771; reference:url,https://www.exploit.observer/?keyword=CVE-2026-56771&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=newsblur&match=exact; sid:1095406; rev:1;)
CVE-2026-56771.rules on GitHub
References
Vendor advisories and patches
- Release Notes (release-notes)
- Patch Commit (1) (patch)
- Patch Commit (2) (patch)
Exploits and technical analysis
- https://www.vulncheck.com/advisories/newsblur-server-side-request-forgery-via-add-url-endpoint (third-party-advisory)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.