CVE-2020-15270

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under NVD CVSS v3. EPSS exploit probability: 1.2%, top 36% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 4.3Exploit: NoneExposed: 0

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

Parse Server (npm package parse-server) broadcasts events to all clients without checking if the session token is valid. This allows clients with expired sessions to still receive subscription objects. It is not possible to create subscription objects with invalid session tokens. The issue is not patched.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
—
EPSS
64.0%
KEV
Not listed

Published

October 22, 2020

Last Modified

November 21, 2024

References (6)

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
parse-server—4.4.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 44× 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. 2026-07-22 22:35 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
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  16. 2026-07-13 00:37 UTCOSV refresh
  17. 2026-07-12 05:44 UTCEPSS rescore
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  1. 2026-07-06 02:21 UTCEPSS rescore
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  15. 2026-06-24 14:03 UTCEPSS rescore
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  17. 2026-06-24 09:42 UTCOSV refresh
  18. 2026-06-23 21:31 UTCEPSS rescore
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  20. 2026-06-22 14:23 UTCEPSS rescore
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  22. 2026-06-21 14:54 UTCEPSS rescore
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  24. 2026-06-21 01:57 UTCEPSS rescore
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  26. 2026-06-19 19:23 UTCEPSS rescore
  27. 2026-06-18 17:50 UTCEPSS rescore
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  37. 2026-06-10 22:16 UTCEPSS rescore
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  39. 2026-06-10 13:20 UTCEPSS rescore
  40. 2026-06-08 14:15 UTCEPSS rescore
  41. 2026-06-08 14:15 UTCEPSS rescore
  42. 2026-06-07 15:23 UTCEPSS rescore
  43. 2026-06-07 15:23 UTCEPSS rescore
  44. 2026-06-07 14:30 UTCOSV refresh
  45. 2026-06-06 13:45 UTCEPSS rescore
  46. 2026-06-06 13:45 UTCEPSS rescore
  47. 2026-06-05 22:45 UTCEPSS rescore
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  49. 2026-06-05 06:08 UTCEPSS rescore
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  51. 2026-06-04 13:10 UTCEPSS rescore
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  53. 2026-06-02 20:11 UTCEPSS rescore
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  55. 2026-06-01 13:50 UTCEPSS rescore
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  61. 2026-05-29 13:42 UTCEPSS rescore
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  68. 2026-05-26 07:17 UTCEPSS rescore
  69. 2026-05-26 07:17 UTCEPSS rescore
  70. 2026-05-23 06:08 UTCEG score recompute

Frequently asked(5)

What is CVE-2020-15270?
CVE-2020-15270 is a medium vulnerability published on October 22, 2020. Parse Server (npm package parse-server) broadcasts events to all clients without checking if the session token is valid. This allows clients with expired sessions to still receive subscription objects. It is not possible to create subscription objects with invalid session tokens. The issue is not…
When was CVE-2020-15270 disclosed?
CVE-2020-15270 was first published in the National Vulnerability Database on October 22, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-15270 actively exploited?
CVE-2020-15270 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-15270?
CVE-2020-15270 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2020-15270?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-15270, 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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