CVE-2026-28176

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-13. 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 a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: 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 Booking Activities <= 1.18.4 versions.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 14, 2026

Advisory Details (1)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic

undefined in undefined undefined undefined - Patchstack

https://patchstack.com/database/wordpress/plugin/booking-activities/vulnerability/wordpress-booking-activities-plugin-1-18-4-php-object-injection-vulnerability?_s_id=cve

Vendor Advisories for CVE-2026-28176(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 27× in last 7d / 111× 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 151 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-28176?
CVE-2026-28176 is a high vulnerability published on August 13, 2026. Unauthenticated PHP Object Injection in Booking Activities <= 1.18.4 versions.
When was CVE-2026-28176 disclosed?
CVE-2026-28176 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-2026-28176 actively exploited?
CVE-2026-28176 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 76.9% of all scored CVEs.
What is the CVSS score of CVE-2026-28176?
CVE-2026-28176 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-28176?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28176, 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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