CVE-2026-16603

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-05. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

The Passster WordPress plugin before 4.3.6 does not enforce its category-based content protection on the WordPress REST API, allowing unauthenticated users to read the full content, title, and excerpt of category-locked posts through the core REST API.

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

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 5, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Content Protector (Passster) < 4.3.6 – Unauthenticated Category-Locked Content Disclosure via Core REST API | CVE 2026-16603 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/ec56a66e-e98a-4260-a0af-3ef6905ce839/

Vendor Advisories for CVE-2026-16603(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 86× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 205 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-16603?
CVE-2026-16603 is a high vulnerability published on August 5, 2026. The Passster WordPress plugin before 4.3.6 does not enforce its category-based content protection on the WordPress REST API, allowing unauthenticated users to read the full content, title, and excerpt of category-locked posts through the core REST API.
When was CVE-2026-16603 disclosed?
CVE-2026-16603 was first published on August 5, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16603 actively exploited?
CVE-2026-16603 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16603?
CVE-2026-16603 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16603?
No fix for CVE-2026-16603 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-16603 are linked in the Vendor Advisories panel on this page.

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