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: 1.0%CVSS: 6.1Exploit: 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 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
6.1MEDIUMmedium confidence
EG Risk
32
EG Risk 32/100CISA 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
Severity61% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or 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
1.0%
EPSS %ILE
61st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or 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 (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

January 19, 2021

Last Modified

July 9, 2026

Advisory Details (2)

Auto-updated Jul 9, 2026
🔬 Proof of concept available. No fix on record 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 / 24× 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 152 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
  4. 2026-09-30 15:17 UTCEG score recompute
  5. 2026-09-30 14:59 UTCEPSS rescore
  6. 2026-09-29 15:14 UTCEPSS rescore
  7. 2026-09-27 13:41 UTCEPSS rescore
  8. 2026-09-26 15:54 UTCEPSS rescore
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  10. 2026-09-24 14:00 UTCEPSS rescore
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  1. 2026-09-04 13:57 UTCEPSS rescore
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  4. 2026-09-01 03:32 UTCEPSS rescore
  5. 2026-08-30 19:14 UTCEPSS rescore
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  7. 2026-08-27 14:21 UTCEPSS rescore
  8. 2026-08-26 14:42 UTCEPSS rescore
  9. 2026-08-25 13:45 UTCEPSS rescore
  10. 2026-08-21 23:45 UTCEPSS rescore
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  17. 2026-08-13 21:57 UTCEPSS rescore
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  27. 2026-07-30 16:25 UTCEPSS rescore
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  30. 2026-07-26 14:51 UTCEPSS rescore
  31. 2026-07-25 14:15 UTCEPSS rescore
  32. 2026-07-24 14:14 UTCEPSS rescore
  33. 2026-07-23 14:15 UTCEPSS rescore
  34. 2026-07-23 14:15 UTCEPSS rescore
  35. 2026-07-23 01:52 UTCEG score recompute
  36. 2026-07-22 22:38 UTCEG score recompute
  37. 2026-07-22 14:05 UTCEPSS rescore
  38. 2026-07-21 15:22 UTCEPSS rescore
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  40. 2026-07-20 17:04 UTCEPSS rescore
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  42. 2026-07-19 14:28 UTCEPSS rescore
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  44. 2026-07-19 02:26 UTCEPSS rescore
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  46. 2026-07-16 16:59 UTCEPSS rescore
  47. 2026-07-15 16:55 UTCEPSS rescore
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  50. 2026-07-13 22:27 UTCEPSS rescore
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  54. 2026-07-12 05:44 UTCEPSS rescore
  55. 2026-07-11 08:25 UTCEPSS rescore
  56. 2026-07-11 08:25 UTCEPSS rescore
  57. 2026-07-09 19:07 UTCEPSS rescore
  58. 2026-07-09 02:55 UTCNVD updateCVSS v3 → 6.1 · severity → MEDIUM
  59. 2026-07-09 01:24 UTCMITRE cvelistV5
  60. 2026-07-08 15:12 UTCEPSS rescore
  61. 2026-07-06 16:25 UTCEPSS rescore
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  63. 2026-07-06 02:21 UTCEPSS rescore
  64. 2026-07-06 02:21 UTCEPSS rescore
  65. 2026-07-05 00:28 UTCNVD updateCVSS v3 → 6.1 · severity → MEDIUM
  66. 2026-07-04 23:36 UTCMITRE cvelistV5
  67. 2026-07-04 06:29 UTCEPSS rescore
  68. 2026-07-04 06:29 UTCEPSS rescore
  69. 2026-06-30 23:20 UTCEPSS rescore
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  71. 2026-06-29 14:04 UTCEPSS rescore
  72. 2026-06-28 04:54 UTCEPSS rescore
  73. 2026-06-28 04:54 UTCEPSS rescore
  74. 2026-06-27 03:06 UTCEPSS rescore
  75. 2026-06-27 03:06 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 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 1.0% probability of exploitation in the next 30 days (61st percentile of EPSS-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?
No fix for CVE-2020-28707 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.

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