Internal service enumeration via RSS feed URL
Published Jul 17, 2026 · Updated Jul 17, 2026
SSRF in XenForo 2.3.8 allows remote authenticated users with RSS feed access to enumerate internal ports and expose the server origin IP. The add/save RSS feed endpoint accepts loopback destinations such as localhost or 127.0.0.1 with attacker-selected ports and causes the server to request them. Reachability requires a registered account permitted to add or save RSS feeds; the disclosed consequence is internal network reconnaissance and origin-IP disclosure.
Summary
What happened
SSRF in XenForo 2.3.8 allows remote authenticated users with RSS feed access to enumerate internal ports and expose the server origin IP. The add/save RSS feed endpoint accepts loopback destinations such as localhost or 127.0.0.1 with attacker-selected ports and causes the server to request them. Reachability requires a registered account permitted to add or save RSS feeds; the disclosed consequence is internal network reconnaissance and origin-IP disclosure.
The record
- CVE
- CVE-2026-51833
- Published
- Jul 17, 2026
- Updated
- Jul 17, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-918, T1046
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 17, 2026CVE publishedPublication date reported by the CVE source.
- Jul 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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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.
Public exploit references
- CVE-2026-51833 public-disclosure proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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