CVE-2026-17021

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-08-10. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.3Exploit: 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 Salon Booking System WordPress plugin before 10.30.34 does not properly restrict access to some of its booking-modification AJAX actions and does not verify ownership of the targeted booking, allowing unauthenticated users to tamper with the stored total of arbitrary bookings.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA 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
Severity53% × 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
0.3%
EPSS %ILE
21st
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

Salon Booking System – Free Version <= 10.30.33 – Unauthenticated Arbitrary Booking Total Tampering | CVE 2026-17021 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/fbbfa907-3efd-4050-9651-d3836af062a9/

Vendor Advisories for CVE-2026-17021(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 15× in last 7d / 68× 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 142 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-17021?
CVE-2026-17021 is a medium vulnerability published on August 10, 2026. The Salon Booking System WordPress plugin before 10.30.34 does not properly restrict access to some of its booking-modification AJAX actions and does not verify ownership of the targeted booking, allowing unauthenticated users to tamper with the stored total of arbitrary bookings.
When was CVE-2026-17021 disclosed?
CVE-2026-17021 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-2026-17021 actively exploited?
CVE-2026-17021 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-17021?
CVE-2026-17021 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-17021?
No fix for CVE-2026-17021 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-2026-17021 are linked in the Vendor Advisories panel on this page.

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