CVE-2026-15426

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 8.8Exploit: 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 AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 10.11.1. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to overwrite the BCC field of the acy_notification_cms notification template, causing subsequent WordPress password-reset emails — including those targeting administrator accounts — to be silently copied to an attacker-controlled address, enabling account takeover via the captured reset link. Successful exploitation requires the site administrator to have enabled the "Send website emails with AcyMailing" option, which routes WordPress core notification emails through AcyMailing's templating system.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* 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, and watch the vendor's advisory for the fix.
EPSS PROB
0.7%
EPSS %ILE
49th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* 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, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 11, 2026

Last Modified

August 12, 2026

References (7)

Vendor Advisories for CVE-2026-15426(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 21× in last 7d / 92× 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 186 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-15426?
CVE-2026-15426 is a high vulnerability published on August 11, 2026. The AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 10.11.1. This is due to the plugin not properly verifying that a user is authorized to perform an action.…
When was CVE-2026-15426 disclosed?
CVE-2026-15426 was first published on August 11, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15426 actively exploited?
CVE-2026-15426 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15426?
CVE-2026-15426 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15426?
No fix for CVE-2026-15426 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-2026-15426 are linked in the Vendor Advisories panel on this page.

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