CVE-2026-2021

MEDIUMPre-NVD 6.46.4—
EchelonGraph scoreMEDIUM confidence

Score 6.4 from GitHub Security Advisory published 2026-06-18. a secondary CVSS source baseline 6.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.4Exploit: None knownExposed: 0

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

The Slideshow Gallery LITE plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'alwaysauto' shortcode attribute in all versions up to, and including, 1.8.5. This is due to insufficient input sanitization and output escaping on user-supplied attributes. 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.

CVSS v3
6.4
EG Score
6.4(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity64% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 18, 2026

References (6)

Vendor Advisories for CVE-2026-2021(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 6× in last 7d / 51× 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 181 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-2021?
CVE-2026-2021 is a medium vulnerability published on June 18, 2026. The Slideshow Gallery LITE plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'alwaysauto' shortcode attribute in all versions up to, and including, 1.8.5. This is due to insufficient input sanitization and output escaping on user-supplied attributes. This makes it possible…
When was CVE-2026-2021 disclosed?
CVE-2026-2021 was first published in the National Vulnerability Database on June 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-2021 actively exploited?
CVE-2026-2021 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 90.2% of all scored CVEs.
What is the CVSS score of CVE-2026-2021?
CVE-2026-2021 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-2021?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-2021, 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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