CVE-2026-28149

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-13. 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.

Unauthenticated PHP Object Injection in Headless Single Sign On <= 1.6 versions.

CVSS v3
9.8
EG Score
9.8(medium)
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
31%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 14, 2026

Advisory Details (1)

Auto-updated Sep 18, 2026
No patch confirmed yet.
generic

PHP Object Injection in WordPress Headless Single Sign On Plugin - Patchstack

https://patchstack.com/database/wordpress/plugin/headless-single-sign-on/vulnerability/wordpress-headless-single-sign-on-plugin-1-6-php-object-injection-vulnerability?_s_id=cve

Vendor Advisories for CVE-2026-28149(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 48× in last 7d / 205× 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 278 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-28149?
CVE-2026-28149 is a critical vulnerability published on August 13, 2026. Unauthenticated PHP Object Injection in Headless Single Sign On <= 1.6 versions.
When was CVE-2026-28149 disclosed?
CVE-2026-28149 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28149 actively exploited?
CVE-2026-28149 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 68.6% of all scored CVEs.
What is the CVSS score of CVE-2026-28149?
CVE-2026-28149 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-28149?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28149, 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.

Dependency Blast Radius

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