CVE-2021-47917

MEDIUMNVD 5.46.4▲
EchelonGraph scoreMEDIUM confidence

Score 6.4 from GitHub Security Advisory published 2026-02-01. NVD baseline CVSS 6.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: Elevated riskExposed: 0

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

Simple CMS 2.1 contains a persistent cross-site scripting vulnerability in user input parameters that allows remote attackers to inject malicious script code. Attackers can exploit the newUser and editUser modules to inject persistent scripts that execute on user list preview, potentially leading to session hijacking and application manipulation.

CVSS v3
5.4
EG Score
6.4(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

February 1, 2026

Last Modified

June 17, 2026

References (3)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 40× 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. 2026-08-01 04:13 UTCEPSS rescore
  2. 2026-07-30 16:25 UTCEPSS rescore
  3. 2026-07-30 01:28 UTCEPSS rescore
  4. 2026-07-28 15:33 UTCEPSS rescore
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  9. 2026-07-23 14:16 UTCEPSS rescore
  10. 2026-07-23 02:06 UTCEG score recompute
  11. 2026-07-22 22:53 UTCEG score recompute
  12. 2026-07-22 14:06 UTCEPSS rescore
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  15. 2026-07-20 17:05 UTCEPSS rescore
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  1. 2026-07-13 06:11 UTCEPSS rescore
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  3. 2026-07-12 05:44 UTCEPSS rescore
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  5. 2026-07-09 19:07 UTCEPSS rescore
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  7. 2026-07-08 15:12 UTCEPSS rescore
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  17. 2026-06-30 23:20 UTCEPSS rescore
  18. 2026-06-29 14:04 UTCEPSS rescore
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  20. 2026-06-28 14:05 UTCEPSS rescore
  21. 2026-06-28 04:54 UTCEPSS rescore
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  23. 2026-06-27 03:07 UTCEPSS rescore
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  25. 2026-06-25 13:48 UTCEPSS rescore
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  27. 2026-06-24 14:03 UTCEPSS rescore
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  29. 2026-06-23 21:31 UTCEPSS rescore
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  35. 2026-06-19 19:24 UTCEPSS rescore
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  37. 2026-06-18 17:51 UTCEPSS rescore
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  40. 2026-06-17 17:51 UTCEPSS rescore
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  45. 2026-06-13 22:58 UTCEPSS rescore
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  47. 2026-06-12 23:10 UTCEPSS rescore
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  49. 2026-06-10 22:16 UTCEPSS rescore
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  51. 2026-06-08 14:15 UTCEPSS rescore
  52. 2026-06-08 14:15 UTCEPSS rescore
  53. 2026-06-08 14:15 UTCEPSS rescore
  54. 2026-06-07 23:08 UTCGHSA enrichment
  55. 2026-06-07 15:23 UTCEPSS rescore
  56. 2026-06-07 15:23 UTCEPSS rescore
  57. 2026-06-06 13:46 UTCEPSS rescore
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  59. 2026-06-05 22:45 UTCEPSS rescore
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  61. 2026-06-05 06:09 UTCEPSS rescore
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  63. 2026-06-04 13:11 UTCEPSS rescore
  64. 2026-06-04 13:10 UTCEPSS rescore
  65. 2026-06-02 20:11 UTCEPSS rescore
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  67. 2026-06-01 13:50 UTCEPSS rescore
  68. 2026-06-01 13:50 UTCEPSS rescore
  69. 2026-05-31 22:29 UTCEPSS rescore
  70. 2026-05-31 00:15 UTCEPSS rescore
  71. 2026-05-31 00:15 UTCEPSS rescore
  72. 2026-05-29 14:56 UTCEG score recompute
  73. 2026-05-29 14:56 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-47917?
CVE-2021-47917 is a medium vulnerability published on February 1, 2026. Simple CMS 2.1 contains a persistent cross-site scripting vulnerability in user input parameters that allows remote attackers to inject malicious script code. Attackers can exploit the newUser and editUser modules to inject persistent scripts that execute on user list preview, potentially leading…
When was CVE-2021-47917 disclosed?
CVE-2021-47917 was first published in the National Vulnerability Database on February 1, 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-2021-47917 actively exploited?
CVE-2021-47917 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 78.8% of all scored CVEs.
What is the CVSS score of CVE-2021-47917?
CVE-2021-47917 has a CVSS v3 base score of 5.4 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.4.
How do I remediate CVE-2021-47917?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47917, 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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