Authentication Bypass Affecting phpsysinfo package, versions *
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN13-PHPSYSINFO-19428032
- published29 Aug 2026
- disclosed28 Aug 2026
Introduced: 28 Aug 2026
NewCVE-2026-55584 (opens in a new tab)How to fix?
There is no fixed version for Debian:13 phpsysinfo.
NVD Description
Note: Versions mentioned in the description apply only to the upstream phpsysinfo package and not the phpsysinfo package as distributed by Debian.
See How to fix? for Debian:13 relevant fixed versions and status.
phpSysInfo is a customizable PHP script that displays system information. Prior to 3.4.6, the PSI_ALLOWED access-control check in read_config.php trusts attacker-controlled X-Forwarded-For and Client-IP HTTP headers before REMOTE_ADDR. A remote unauthenticated attacker can supply an allowed address in one of these headers to impersonate a trusted client and access exposed hostname, kernel, CPU, memory, filesystem, and network-interface information. This issue is fixed in version 3.4.6.
References
- https://security-tracker.debian.org/tracker/CVE-2026-55584
- https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc87c4b9ab
- https://github.com/phpsysinfo/phpsysinfo/releases/tag/v3.4.6
- https://github.com/phpsysinfo/phpsysinfo/security/advisories/GHSA-786w-p5pm-cvgh
- https://www.exploit-db.com/exploits/52648