CVE-2026-15964

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-01. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

The Single Sign On For TNG plugin for WordPress is vulnerable to Authentication Bypass via unauthenticated password reset in all versions up to, and including, 2.0.0. This is due to the ssoprocess_ajax() function — registered on wp_ajax_nopriv_ssoprocess_ajax and therefore reachable without authentication — accepting an attacker-supplied email parameter with the setnewpassword operation and calling reset_password() on the resolved account without any ownership token, email confirmation link, or capability check. The sole guard is a call to check_ajax_referer(), which provides no authorization barrier because the ssoajaxnonce nonce is publicly broadcast on every front-end page via wp_localize_script() into the SSOPWDREQUIREMENT JavaScript object; since WordPress computes nonces for logged-out visitors against a shared anonymous session context, any unauthenticated visitor can scrape a valid nonce from the homepage and use it to authenticate the request. This makes it possible for unauthenticated attackers to change the password of any WordPress account, including administrator accounts, enabling complete site takeover.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

August 1, 2026

Last Modified

August 12, 2026

References (6)

Vendor Advisories for CVE-2026-15964(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 57× in last 7d / 172× 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 172 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-15964?
CVE-2026-15964 is a critical vulnerability published on August 1, 2026. The Single Sign On For TNG plugin for WordPress is vulnerable to Authentication Bypass via unauthenticated password reset in all versions up to, and including, 2.0.0. This is due to the ssoprocessajax() function — registered on wpajaxnoprivssoprocessajax and therefore reachable without…
When was CVE-2026-15964 disclosed?
CVE-2026-15964 was first published in the National Vulnerability Database on August 1, 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-2026-15964 actively exploited?
CVE-2026-15964 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.8% of all scored CVEs.
What is the CVSS score of CVE-2026-15964?
CVE-2026-15964 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-15964?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15964, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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