CVE-2026-16257

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-08-10. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.2EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.2Exploit: None knownExposed services: Not assessed

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

The Arvow AI SEO Writer WordPress plugin before 1.5.4 does not properly restrict access to one of its REST endpoints, whose only access control can be bypassed by unauthenticated users through type juggling when the Arvow AI SEO Writer WordPress plugin before 1.5.4 has not been configured, allowing them to create arbitrary posts and pages and to disclose author account and taxonomy information.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
52
EG Risk 52/100CISA 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
Severity82% × 45%
Exploitation0% × 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
27th
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 none (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 10, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Arvow AI SEO Writer < 1.5.4 – Unauthenticated Arbitrary Post Creation via Webhook Secret Type-Juggling | CVE 2026-16257 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/89c32854-1cf1-4fe9-a6d0-6244be2dcc03/

Vendor Advisories for CVE-2026-16257(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 181 total refreshes for this CVE.

  1. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 22:55 UTCGHSA enrichment
  3. 2026-10-04 05:38 UTCEG score recompute
  4. 2026-10-04 05:38 UTCGHSA enrichment
  5. 2026-10-03 14:25 UTCEPSS rescore
  6. 2026-10-03 00:57 UTCEG score recompute
  7. 2026-10-03 00:57 UTCGHSA enrichment
  8. 2026-10-02 09:26 UTCEG score recompute
  9. 2026-10-02 09:26 UTCGHSA enrichment
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-10-01 12:09 UTCGHSA enrichment
  12. 2026-09-30 22:50 UTCEG score recompute
  13. 2026-09-30 22:50 UTCGHSA enrichment
  14. 2026-09-30 15:02 UTCEPSS rescore
  15. 2026-09-29 15:20 UTCEPSS rescore
  16. 2026-09-29 05:32 UTCEG score recompute
  17. 2026-09-29 05:32 UTCGHSA enrichment
  18. 2026-09-28 13:51 UTCEPSS rescore
  19. 2026-09-28 05:47 UTCGHSA enrichment
  20. 2026-09-27 17:02 UTCEG score recompute
  21. 2026-09-27 17:02 UTCGHSA enrichment
  22. 2026-09-27 13:47 UTCEPSS rescore
  23. 2026-09-26 15:58 UTCEPSS rescore
  24. 2026-09-25 04:09 UTCEG score recompute
  25. 2026-09-25 04:09 UTCGHSA enrichment
Show 75 more
  1. 2026-09-24 03:29 UTCGHSA enrichment
  2. 2026-09-23 14:44 UTCEG score recompute
  3. 2026-09-23 14:44 UTCGHSA enrichment
  4. 2026-09-23 01:58 UTCEG score recompute
  5. 2026-09-23 01:58 UTCGHSA enrichment
  6. 2026-09-22 13:12 UTCGHSA enrichment
  7. 2026-09-22 00:25 UTCEG score recompute
  8. 2026-09-22 00:25 UTCGHSA enrichment
  9. 2026-09-21 03:35 UTCEG score recompute
  10. 2026-09-21 03:35 UTCGHSA enrichment
  11. 2026-09-20 10:52 UTCGHSA enrichment
  12. 2026-09-19 20:10 UTCEG score recompute
  13. 2026-09-19 20:09 UTCGHSA enrichment
  14. 2026-09-19 06:38 UTCEG score recompute
  15. 2026-09-19 06:37 UTCGHSA enrichment
  16. 2026-09-18 19:27 UTCEPSS rescore
  17. 2026-09-18 17:23 UTCGHSA enrichment
  18. 2026-09-18 03:52 UTCEG score recompute
  19. 2026-09-18 03:52 UTCGHSA enrichment
  20. 2026-09-17 15:07 UTCGHSA enrichment
  21. 2026-09-17 00:51 UTCEG score recompute
  22. 2026-09-17 00:51 UTCGHSA enrichment
  23. 2026-09-16 14:07 UTCEPSS rescore
  24. 2026-09-16 05:14 UTCEPSS rescore
  25. 2026-09-16 05:09 UTCGHSA enrichment
  26. 2026-09-15 16:06 UTCEG score recompute
  27. 2026-09-15 16:06 UTCGHSA enrichment
  28. 2026-09-15 02:47 UTCGHSA enrichment
  29. 2026-09-14 14:02 UTCGHSA enrichment
  30. 2026-09-14 00:51 UTCEG score recompute
  31. 2026-09-14 00:51 UTCGHSA enrichment
  32. 2026-09-13 16:46 UTCEPSS rescore
  33. 2026-09-13 12:06 UTCGHSA enrichment
  34. 2026-09-12 23:21 UTCEG score recompute
  35. 2026-09-12 23:21 UTCGHSA enrichment
  36. 2026-09-12 15:00 UTCEPSS rescore
  37. 2026-09-12 10:29 UTCGHSA enrichment
  38. 2026-09-11 21:44 UTCEG score recompute
  39. 2026-09-11 21:44 UTCGHSA enrichment
  40. 2026-09-11 14:52 UTCEPSS rescore
  41. 2026-09-11 09:36 UTCEPSS rescore
  42. 2026-09-11 08:59 UTCGHSA enrichment
  43. 2026-09-10 20:14 UTCEG score recompute
  44. 2026-09-10 20:14 UTCGHSA enrichment
  45. 2026-09-10 09:34 UTCEPSS rescore
  46. 2026-09-10 07:29 UTCGHSA enrichment
  47. 2026-09-09 18:42 UTCEG score recompute
  48. 2026-09-09 18:42 UTCGHSA enrichment
  49. 2026-09-09 05:57 UTCEG score recompute
  50. 2026-09-09 05:57 UTCGHSA enrichment
  51. 2026-09-08 22:00 UTCEPSS rescore
  52. 2026-09-08 07:25 UTCGHSA enrichment
  53. 2026-09-07 17:34 UTCEG score recompute
  54. 2026-09-07 17:34 UTCGHSA enrichment
  55. 2026-09-07 16:01 UTCEPSS rescore
  56. 2026-09-06 17:26 UTCEG score recompute
  57. 2026-09-06 17:26 UTCGHSA enrichment
  58. 2026-09-06 13:47 UTCEPSS rescore
  59. 2026-09-06 04:40 UTCGHSA enrichment
  60. 2026-09-05 15:55 UTCEG score recompute
  61. 2026-09-05 15:55 UTCGHSA enrichment
  62. 2026-09-05 02:15 UTCEG score recompute
  63. 2026-09-05 02:15 UTCGHSA enrichment
  64. 2026-09-04 08:32 UTCEG score recompute
  65. 2026-09-04 08:32 UTCGHSA enrichment
  66. 2026-09-04 05:06 UTCEPSS rescore
  67. 2026-09-03 17:12 UTCGHSA enrichment
  68. 2026-09-03 03:54 UTCEG score recompute
  69. 2026-09-03 03:54 UTCGHSA enrichment
  70. 2026-09-02 14:11 UTCEPSS rescore
  71. 2026-09-02 06:40 UTCGHSA enrichment
  72. 2026-09-01 17:34 UTCEG score recompute
  73. 2026-09-01 17:34 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-2026-16257?
CVE-2026-16257 is a high vulnerability published on August 10, 2026. The Arvow AI SEO Writer WordPress plugin before 1.5.4 does not properly restrict access to one of its REST endpoints, whose only access control can be bypassed by unauthenticated users through type juggling when the Arvow AI SEO Writer WordPress plugin before 1.5.4 has not been configured, allowing…
When was CVE-2026-16257 disclosed?
CVE-2026-16257 was first published on August 10, 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-2026-16257 actively exploited?
CVE-2026-16257 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16257?
CVE-2026-16257 has a CVSS v3.1 base score of 8.2 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16257?
No fix for CVE-2026-16257 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-2026-16257 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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