CVE-2021-47860

MEDIUMNVD 4.35.3▲
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory (severity: HIGH) published 2026-01-21. NVD baseline CVSS 4.3; sources differ by 1.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: Elevated riskExposed: 0

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

GetSimple CMS Custom JS 0.1 plugin contains a cross-site request forgery vulnerability that allows unauthenticated attackers to inject arbitrary client-side code into administrator browsers. Attackers can craft a malicious website that triggers a cross-site scripting payload to execute remote code on the hosting server when an authenticated administrator visits the page.

CVSS v3
4.3
EG Score
5.3(medium)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

January 21, 2026

Last Modified

June 17, 2026

Advisory Details (6)

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

GetSimple CMS Custom JS 0.1 - CSRF to XSS to RCE | Advisories | VulnCheck

https://www.vulncheck.com/advisories/getsimple-cms-custom-js-csrf-to-xss-to-rce
generic🟡 PoC Available

GetSimple CMS Custom JS 0.1 - Cross-Site Request Forgery - PHP webapps Exploit

https://www.exploit-db.com/exploits/49816
generic🟡 PoC Available

'customhs_js_content' - 'customhs_js_content' Cross-Site Request Forgery - PHP webapps Exploit

https://www.exploit-db.com/exploits/49712
generic

GitHub - boku7/gsCMS-CustomJS-Csrf2Xss2Rce: GetSimple CMS Custom JS Plugin Exploit RCE Chain · GitHub

https://github.com/boku7/gsCMS-CustomJS-Csrf2Xss2Rce
generic

GitHub - GetSimpleCMS/GetSimpleCMS: GetSimple CMS · GitHub

https://github.com/GetSimpleCMS/GetSimpleCMS
generic

GetSimple Content Management System | GetSimpleCMS

http://get-simple.info

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× 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 157 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-47860?
CVE-2021-47860 is a medium vulnerability published on January 21, 2026. GetSimple CMS Custom JS 0.1 plugin contains a cross-site request forgery vulnerability that allows unauthenticated attackers to inject arbitrary client-side code into administrator browsers. Attackers can craft a malicious website that triggers a cross-site scripting payload to execute remote code…
When was CVE-2021-47860 disclosed?
CVE-2021-47860 was first published in the National Vulnerability Database on January 21, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47860 actively exploited?
CVE-2021-47860 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 80.6% of all scored CVEs.
What is the CVSS score of CVE-2021-47860?
CVE-2021-47860 has a CVSS v3 base score of 4.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 5.3.
How do I remediate CVE-2021-47860?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47860, 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

Explore the affected products and dependency analysis for CVE-2021-47860

Explore →

Is Your Infrastructure Affected by CVE-2021-47860?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs