CVE-2026-54588

CRITICALPre-NVD 9.69.6
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (45th 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

Also known asEUVD-2026-38633 (ENISA EUVD) · GHSA-3735-5339-xfwx (GitHub Security Advisories)Source: ENISA EUVD

9.6EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Poweradmin is a web-based DNS administration tool for PowerDNS server. Versions prior to 4.2.4 and 4.3.3 use the attacker-controlled HTTP_HOST request header as the authoritative source for building callback URLs in its OIDC, SAML, and logout authentication flows without any validation. An unauthenticated attacker can poison the redirect_uri sent to the Identity Provider, causing the IdP to redirect the victim's authorization code to an attacker-controlled server - resulting in full account takeover with no credentials required. Versions 4.2.4 and 4.3.3 patch the issue.

CVSS v3
9.6
EG Score
9.6CRITICALmedium confidence
EG Risk
43
EG Risk 43/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity96% × 45%
Impact severity (EG Severity): CVSS 9.6 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.5%
EPSS %ILE
45th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.6): severity, escalated by confirmed exploitation. This CVE's 9.6 is its impact severity (EG Severity), not escalated.

EG Severity
9.6 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-26). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (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

June 23, 2026

Last Modified

June 25, 2026

Advisory Details (3)

Auto-updated Oct 7, 2026
Patch available. Sources: github_release, github.
GitHub advisoryMentions a patch (unverified)

Host Header Injection in OIDC redirect_uri, SAML ACS/SLO URL, and Logout Redirect Construction. · Advisory · poweradmin/poweradmin · GitHub

https://github.com/poweradmin/poweradmin/security/advisories/GHSA-3735-5339-xfwx
GitHub release Patch Available

v4.3.3

Patch available: poweradmin/poweradmin v4.3.3

https://github.com/poweradmin/poweradmin/releases/tag/v4.3.3
GitHub release Patch Available

v4.2.4

Patch available: poweradmin/poweradmin v4.2.4

https://github.com/poweradmin/poweradmin/releases/tag/v4.2.4

Vendor Advisories for CVE-2026-54588(1)

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

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
poweradmin/poweradminv4.3.0, v4.3.1, v4.3.2
  • every version up to 4.2.4: fixed in 4.2.4
  • 4.3.0 up to 4.3.3: fixed in 4.3.3
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 50× 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.

Showing the most recent 100 of 182 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 82 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  2. 2026-10-27 11:29 UTCEG score recompute
  3. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  4. 2026-10-26 11:31 UTCEG score recompute
  5. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 45th percentile
  6. 2026-10-25 14:19 UTCEG score recompute
  7. 2026-10-25 11:27 UTCEG score recompute
  8. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  9. 2026-10-24 11:27 UTCEG score recompute
  10. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  11. 2026-10-23 11:27 UTCEG score recompute
  12. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  13. 2026-10-22 11:27 UTCEG score recompute
  14. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  15. 2026-10-21 11:27 UTCEG score recompute
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  17. 2026-10-20 11:28 UTCEG score recompute
  18. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  19. 2026-10-19 11:25 UTCEG score recompute
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  21. 2026-10-18 03:30 UTCEG score recompute
  22. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  23. 2026-10-17 07:23 UTCEG score recompute
  24. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  25. 2026-10-16 07:23 UTCEG score recompute
Show 75 more
  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-15 06:18 UTCEG score recompute
  3. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-14 01:58 UTCEG score recompute
  5. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  6. 2026-10-12 22:15 UTCEG score recompute
  7. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-10-12 15:56 UTCEG score recompute
  9. 2026-10-11 19:39 UTCEG score recompute
  10. 2026-10-11 16:54 UTCEG score recompute
  11. 2026-10-11 14:17 UTCEG score recompute
  12. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  25. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  26. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  27. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  28. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  29. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  30. 2026-09-23 11:56 UTCEG score recompute
  31. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  32. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  33. 2026-09-18 10:19 UTCEG score recompute
  34. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  35. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  36. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  37. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  38. 2026-09-14 02:04 UTCEG score recompute
  39. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  40. 2026-09-13 12:20 UTCEG score recompute
  41. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  42. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  43. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  44. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  45. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  46. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  47. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  48. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  49. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  50. 2026-08-30 20:24 UTCEG score recompute
  51. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  52. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  53. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  54. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  55. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  56. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  57. 2026-08-24 22:05 UTCEG score recompute
  58. 2026-08-24 13:53 UTCEG score recompute
  59. 2026-08-23 03:20 UTCEG score recompute
  60. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  61. 2026-08-22 13:43 UTCEG score recompute
  62. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  63. 2026-08-21 01:20 UTCEG score recompute
  64. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  65. 2026-08-20 07:44 UTCEG score recompute
  66. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  67. 2026-08-19 04:47 UTCEG score recompute
  68. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  69. 2026-08-17 15:26 UTCEG score recompute
  70. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  71. 2026-08-16 18:32 UTCEG score recompute
  72. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  73. 2026-08-16 05:44 UTCEG score recompute
  74. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  75. 2026-08-15 04:06 UTCEG score recompute

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Packagist:poweradmin/poweradmin

Frequently asked(5)

What is CVE-2026-54588?
CVE-2026-54588 is a critical-severity vulnerability; its CVE record was published on June 23, 2026. Poweradmin is a web-based DNS administration tool for PowerDNS server. Versions prior to 4.2.4 and 4.3.3 use the attacker-controlled HTTPHOST request header as the authoritative source for building callback URLs in its OIDC, SAML, and logout authentication flows without any validation. An…
When was the CVE record for CVE-2026-54588 published?
The CVE record for CVE-2026-54588 was published on June 23, 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 June 25, 2026; the record at its source may have been updated since.
Is CVE-2026-54588 actively exploited?
CVE-2026-54588 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54588?
CVE-2026-54588 has a CVSS base score of 9.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54588?
A fix for CVE-2026-54588 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54588 are linked in the Vendor Advisories panel on this page.

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