CVE-2026-55584

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.9% (79th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 1.9%CVSS: 7.5Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.9%
EPSS %ILE
79th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 28, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 28, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

IP allowlist (PSI_ALLOWED) bypass via spoofed X-Forwarded-For / Client-IP headers · Advisory · phpsysinfo/phpsysinfo · GitHub

https://github.com/phpsysinfo/phpsysinfo/security/advisories/GHSA-786w-p5pm-cvgh
GitHub release Patch Available

phpSysInfo 3.4.6

Patch available: phpsysinfo/phpsysinfo v3.4.6

https://github.com/phpsysinfo/phpsysinfo/releases/tag/v3.4.6
GitHub commit Patch Available

commit 019fa2d7e568 (phpsysinfo/phpsysinfo)

Patch available: phpsysinfo/phpsysinfo v3.4.6 (contains commit 019fa2d7e568)

https://github.com/phpsysinfo/phpsysinfo/commit/019fa2d7e568ea11461adb4bd33da5dc87c4b9ab

Vendor Advisories for CVE-2026-55584(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
phpsysinfo3.4.2-3 ... 3.4.4-2 (6 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
phpsysinfo3.4.4-1, 3.4.4-2
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
phpsysinfo3.4.4-1, 3.4.4-2
  • every version on: no fix on record
—
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
phpsysinfo/phpsysinfov3.1.13 ... v3.4.5 (27 versions)
  • every version up to 3.4.6: fixed in 3.4.6
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 54× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:17 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  9. 2026-10-10 00:49 UTCEG score recompute
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  11. 2026-10-09 02:38 UTCEG score recompute
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  13. 2026-10-08 00:50 UTCEG score recompute
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  15. 2026-10-07 03:07 UTCEG score recompute
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  17. 2026-10-06 00:47 UTCEG score recompute
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  19. 2026-10-05 08:45 UTCEG score recompute
  20. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  21. 2026-10-03 15:12 UTCEG score recompute
  22. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  23. 2026-10-03 02:00 UTCEG score recompute
  24. 2026-10-02 17:56 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  25. 2026-10-01 22:31 UTCEG score recompute
Show 58 more
  1. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  2. 2026-09-30 19:49 UTCEG score recompute
  3. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  4. 2026-09-29 15:40 UTCEG score recompute
  5. 2026-09-29 15:22 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  6. 2026-09-29 02:28 UTCEG score recompute
  7. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  8. 2026-09-28 00:07 UTCEG score recompute
  9. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  10. 2026-09-26 21:14 UTCEG score recompute
  11. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  12. 2026-09-26 08:04 UTCEG score recompute
  13. 2026-09-24 18:42 UTCEG score recompute
  14. 2026-09-24 14:04 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  15. 2026-09-24 04:37 UTCEG score recompute
  16. 2026-09-23 17:54 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  17. 2026-09-23 02:06 UTCEG score recompute
  18. 2026-09-21 23:45 UTCEG score recompute
  19. 2026-09-19 18:43 UTCEG score recompute
  20. 2026-09-19 05:33 UTCEG score recompute
  21. 2026-09-18 19:28 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  22. 2026-09-18 03:12 UTCEG score recompute
  23. 2026-09-17 19:31 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  24. 2026-09-17 00:52 UTCEG score recompute
  25. 2026-09-16 14:08 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  26. 2026-09-16 11:41 UTCEG score recompute
  27. 2026-09-16 05:15 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  28. 2026-09-15 09:21 UTCEG score recompute
  29. 2026-09-15 03:11 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  30. 2026-09-13 17:51 UTCEG score recompute
  31. 2026-09-13 16:47 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  32. 2026-09-12 15:29 UTCEG score recompute
  33. 2026-09-12 02:19 UTCEG score recompute
  34. 2026-09-11 14:53 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  35. 2026-09-11 13:08 UTCEG score recompute
  36. 2026-09-10 10:21 UTCEG score recompute
  37. 2026-09-10 09:35 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  38. 2026-09-09 01:30 UTCEG score recompute
  39. 2026-09-08 22:01 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  40. 2026-09-06 20:45 UTCEG score recompute
  41. 2026-09-06 13:47 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  42. 2026-09-05 18:24 UTCEG score recompute
  43. 2026-09-04 16:03 UTCEG score recompute
  44. 2026-09-04 05:06 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  45. 2026-09-03 00:25 UTCEG score recompute
  46. 2026-09-02 14:12 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  47. 2026-09-01 21:51 UTCEG score recompute
  48. 2026-09-01 13:54 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  49. 2026-09-01 08:41 UTCEG score recompute
  50. 2026-09-01 04:40 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  51. 2026-08-31 19:31 UTCEG score recompute
  52. 2026-08-31 18:57 UTCEG score recompute
  53. 2026-08-31 01:08 UTCEG score recompute
  54. 2026-08-30 19:17 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  55. 2026-08-30 11:58 UTCEG score recompute
  56. 2026-08-30 01:22 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  57. 2026-08-28 20:24 UTCEG score recompute
  58. 2026-08-28 19:10 UTCEG score recomputeFirst assessed: 7.5 HIGH

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 Exploit-DB entry). Defenders should treat patch urgency accordingly.

  • Exploit-DBEDB-52648
    Published Aug 17, 2026

    phpSysInfo 3.4.5 - IP Allowlist Bypass

    Open source ↗

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-55584?
CVE-2026-55584 is a high-severity vulnerability; its CVE record was published on August 28, 2026. phpSysInfo is a customizable PHP script that displays system information. Prior to 3.4.6, the PSIALLOWED access-control check in readconfig.php trusts attacker-controlled X-Forwarded-For and Client-IP HTTP headers before REMOTE_ADDR. A remote unauthenticated attacker can supply an allowed address…
When was the CVE record for CVE-2026-55584 published?
The CVE record for CVE-2026-55584 was published on August 28, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-55584 actively exploited?
CVE-2026-55584 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.9% probability of exploitation in the next 30 days (79th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55584?
CVE-2026-55584 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55584?
A fix for CVE-2026-55584 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55584 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-55584

Explore →

Is Your Infrastructure Affected by CVE-2026-55584?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs