CVE-2020-28707

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.1Exploit: None knownExposed: 0

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

The Stockdio Historical Chart plugin before 2.8.1 for WordPress is affected by Cross Site Scripting (XSS) via stockdio_chart_historical-wp.js in wp-content/plugins/stockdio-historical-chart/assets/ because the origin of a postMessage() event is not validated. The stockdio_eventer function listens for any postMessage event. After a message event is sent to the application, this function sets the "e" variable as the event and checks that the types of the data and data.method are not undefined (empty) before proceeding to eval the data.method received from the postMessage. However, on a different website. JavaScript code can call window.open for the vulnerable WordPress instance and do a postMessage(msg,'*') for that object.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity61% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
60%
KEV
Not listed

Published

January 19, 2021

Last Modified

July 9, 2026

Advisory Details (2)

Auto-updated Jul 9, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

Stockdio Historical Chart – WordPress plugin | WordPress.org

https://wordpress.org/plugins/stockdio-historical-chart/#developers
generic🟡 PoC Available

jondow | CVE-2020-28707 – XSS in Stockdio Historical Chart plugin for WordPress before version 2.8.1

https://jondow.eu/cve-2020-28707-xss-in-stockdio-historical-chart-plugin-for-wordpress-before-version-281/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 27× 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 117 total refreshes for this CVE.

  1. 2026-08-20 22:52 UTCEPSS rescore
  2. 2026-08-19 17:00 UTCEPSS rescore
  3. 2026-08-18 13:44 UTCEPSS rescore
  4. 2026-08-16 14:52 UTCEPSS rescore
  5. 2026-08-16 02:11 UTCEPSS rescore
  6. 2026-08-15 01:26 UTCEPSS rescore
  7. 2026-08-13 21:57 UTCEPSS rescore
  8. 2026-08-12 13:47 UTCEPSS rescore
  9. 2026-08-09 13:43 UTCEPSS rescore
  10. 2026-08-08 16:33 UTCEPSS rescore
  11. 2026-08-07 16:23 UTCEPSS rescore
  12. 2026-08-06 13:43 UTCEPSS rescore
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  14. 2026-08-04 10:34 UTCEPSS rescore
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  17. 2026-07-30 16:25 UTCEPSS rescore
  18. 2026-07-30 01:27 UTCEPSS rescore
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  24. 2026-07-23 14:15 UTCEPSS rescore
  25. 2026-07-23 01:52 UTCEG score recompute
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  1. 2026-07-22 22:38 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
  5. 2026-07-20 17:04 UTCEPSS rescore
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  7. 2026-07-19 14:28 UTCEPSS rescore
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  9. 2026-07-19 02:26 UTCEPSS rescore
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  11. 2026-07-16 16:59 UTCEPSS rescore
  12. 2026-07-15 16:55 UTCEPSS rescore
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  14. 2026-07-15 01:57 UTCEPSS rescore
  15. 2026-07-13 22:27 UTCEPSS rescore
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  17. 2026-07-13 06:10 UTCEPSS rescore
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  19. 2026-07-12 05:44 UTCEPSS rescore
  20. 2026-07-11 08:25 UTCEPSS rescore
  21. 2026-07-11 08:25 UTCEPSS rescore
  22. 2026-07-09 19:07 UTCEPSS rescore
  23. 2026-07-09 02:55 UTCNVD updateCVSS v3 → 6.1 · severity → MEDIUM
  24. 2026-07-09 01:24 UTCMITRE cvelistV5
  25. 2026-07-08 15:12 UTCEPSS rescore
  26. 2026-07-06 16:25 UTCEPSS rescore
  27. 2026-07-06 16:25 UTCEPSS rescore
  28. 2026-07-06 02:21 UTCEPSS rescore
  29. 2026-07-06 02:21 UTCEPSS rescore
  30. 2026-07-05 00:28 UTCNVD updateCVSS v3 → 6.1 · severity → MEDIUM
  31. 2026-07-04 23:36 UTCMITRE cvelistV5
  32. 2026-07-04 06:29 UTCEPSS rescore
  33. 2026-07-04 06:29 UTCEPSS rescore
  34. 2026-06-30 23:20 UTCEPSS rescore
  35. 2026-06-30 23:20 UTCEPSS rescore
  36. 2026-06-29 14:04 UTCEPSS rescore
  37. 2026-06-28 04:54 UTCEPSS rescore
  38. 2026-06-28 04:54 UTCEPSS rescore
  39. 2026-06-27 03:06 UTCEPSS rescore
  40. 2026-06-27 03:06 UTCEPSS rescore
  41. 2026-06-25 13:48 UTCEPSS rescore
  42. 2026-06-24 14:03 UTCEPSS rescore
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  44. 2026-06-23 21:31 UTCEPSS rescore
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  46. 2026-06-22 14:23 UTCEPSS rescore
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  48. 2026-06-21 14:54 UTCEPSS rescore
  49. 2026-06-21 14:54 UTCEPSS rescore
  50. 2026-06-21 01:57 UTCEPSS rescore
  51. 2026-06-19 19:24 UTCEPSS rescore
  52. 2026-06-19 19:23 UTCEPSS rescore
  53. 2026-06-18 17:50 UTCEPSS rescore
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  55. 2026-06-17 17:50 UTCEPSS rescore
  56. 2026-06-16 17:50 UTCEPSS rescore
  57. 2026-06-15 17:46 UTCEPSS rescore
  58. 2026-06-14 23:15 UTCEPSS rescore
  59. 2026-06-13 22:58 UTCEPSS rescore
  60. 2026-06-12 23:10 UTCEPSS rescore
  61. 2026-06-11 13:58 UTCEPSS rescore
  62. 2026-06-10 22:16 UTCEPSS rescore
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  65. 2026-06-07 15:23 UTCEPSS rescore
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  68. 2026-06-06 13:46 UTCEPSS rescore
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  70. 2026-06-05 22:45 UTCEPSS rescore
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  72. 2026-06-05 06:08 UTCEPSS rescore
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  74. 2026-06-04 13:10 UTCEPSS rescore
  75. 2026-06-04 13:10 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-28707?
CVE-2020-28707 is a medium vulnerability published on January 19, 2021. The Stockdio Historical Chart plugin before 2.8.1 for WordPress is affected by Cross Site Scripting (XSS) via stockdiocharthistorical-wp.js in wp-content/plugins/stockdio-historical-chart/assets/ because the origin of a postMessage() event is not validated. The stockdio_eventer function listens for…
When was CVE-2020-28707 disclosed?
CVE-2020-28707 was first published in the National Vulnerability Database on January 19, 2021, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-28707 actively exploited?
CVE-2020-28707 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 39.7% of all scored CVEs.
What is the CVSS score of CVE-2020-28707?
CVE-2020-28707 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2020-28707?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-28707, 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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