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CVE-2026-55584 is an authentication bypass in phpSysInfo versions prior to 3.4.6. The PSI_ALLOWED access-control logic in read_config.php evaluates attacker-controlled X-Forwarded-For and Client-IP HTTP headers before the connection-derived REMOTE_ADDR value. An unauthenticated remote attacker can supply an allowlisted address in either header to be treated as a trusted client and bypass the IP-based access restriction.
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No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remotely reachable, low-complexity, unauthenticated vulnerability with no user interaction required that can cause high confidentiality impact. The provided content identifies Debian Linux versions 11.0 through 14.0 as affected but does not identify the vulnerable component or flaw mechanism.
An IP allowlist bypass in phpSysInfo read_config.php. An unauthenticated remote attacker can spoof an allowed address in X-Forwarded-For or Client-IP to bypass PSI_ALLOWED and access exposed system information.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.