CVE-2026-8900

MEDIUMPre-NVD 6.46.4—
EchelonGraph scoreHIGH confidence

Score 6.4 from GitHub Security Advisory published 2026-06-06. a secondary CVSS source baseline 6.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.4Exploit: NoneExposed: 0

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

The Simple SEO Slideshow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 1.2.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. WordPress KSES does not strip malicious shortcode attribute values on post save, allowing contributor-level users to persist payloads that execute for any visitor, including administrators reviewing the post.

CVSS v3
6.4
EG Score
6.4(high)
EPSS
9.0%
KEV
Not listed

Published

June 5, 2026

Last Modified

June 8, 2026

References (5)

Vendor Advisories for CVE-2026-8900(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 / 94× 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.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8900?
CVE-2026-8900 is a medium vulnerability published on June 5, 2026. The Simple SEO Slideshow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 1.2.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level…
When was CVE-2026-8900 disclosed?
CVE-2026-8900 was first published in the National Vulnerability Database on June 5, 2026, with the most recent update on June 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8900 actively exploited?
CVE-2026-8900 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8900?
CVE-2026-8900 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-8900?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8900, 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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