CVE-2023-45311

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.5%, top 28% 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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

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

fsevents before 1.2.11 depends on the https://fsevents-binaries.s3-us-west-2.amazonaws.com URL, which might allow an adversary to execute arbitrary code if any JavaScript project (that depends on fsevents) distributes code that was obtained from that URL at a time when it was controlled by an adversary. NOTE: some sources feel that this means that no version is affected any longer, because the URL is not controlled by an adversary.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation2% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
72%
KEV
Not listed

Published

October 6, 2023

Last Modified

June 17, 2026

Advisory Details (8)

Auto-updated Jul 26, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

react-immutable-proptypes/package-lock.json at ddb9fa5194b931bf7528eb4f2c0a8c3434f70edd · atlassian/react-immutable-proptypes · GitHub

https://github.com/atlassian/react-immutable-proptypes/blob/ddb9fa5194b931bf7528eb4f2c0a8c3434f70edd/package-lock.json#L153
generic

moo/package-lock.json at 56ccbdd41b493332bc2cd7a4097a5802594cdb9c · atlassian/moo · GitHub

https://github.com/atlassian/moo/blob/56ccbdd41b493332bc2cd7a4097a5802594cdb9c/package-lock.json#L1901-L1902
generic🔴 Active Exploitation

Exposure of Resource to Wrong Sphere in fsevents | CVE-2023-45311 | Snyk

https://security.snyk.io/vuln/SNYK-JS-FSEVENTS-5487987
generic

Comparing v1.2.10...v1.2.11 · fsevents/fsevents · GitHub

https://github.com/fsevents/fsevents/compare/v1.2.10...v1.2.11
generic

serverless-cloudflare-workers/package-lock.json at e95e1e9c9770ed9a3d9480c1fa73e64391268354 · cloudflare/serverless-cloudflare-workers · GitHub

https://github.com/cloudflare/serverless-cloudflare-workers/blob/e95e1e9c9770ed9a3d9480c1fa73e64391268354/package-lock.json#L737
generic

redux-grim/package-lock.json at b652f99f95fb16812336073951adc5c5a93e2c23 · cloudflare/redux-grim · GitHub

https://github.com/cloudflare/redux-grim/blob/b652f99f95fb16812336073951adc5c5a93e2c23/package-lock.json#L266-L267
generic

hugo-cloudflare-docs/package-lock.json at e0f7cfa195af8ef1bfa51a487be7d34ba298ed06 · cloudflare/hugo-cloudflare-docs · GitHub

https://github.com/cloudflare/hugo-cloudflare-docs/blob/e0f7cfa195af8ef1bfa51a487be7d34ba298ed06/package-lock.json#L494
generic

authr/ts/package-lock.json at 3f6129d97d06e61033a7f237d84e35e678db490f · cloudflare/authr · GitHub

https://github.com/cloudflare/authr/blob/3f6129d97d06e61033a7f237d84e35e678db490f/ts/package-lock.json#L1512

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
fsevents—1.2.11—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 49× 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 114 total refreshes for this CVE.

  1. 2026-07-26 14:52 UTCEPSS rescore
  2. 2026-07-26 14:52 UTCEPSS rescore
  3. 2026-07-25 14:16 UTCEPSS rescore
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  7. 2026-07-23 02:27 UTCEG score recompute
  8. 2026-07-22 23:13 UTCEG score recompute
  9. 2026-07-22 14:06 UTCEPSS rescore
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  21. 2026-07-15 07:49 UTCOSV refresh
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  22. 2026-06-27 08:34 UTCOSV refresh
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  56. 2026-06-09 18:47 UTCOSV refresh
  57. 2026-06-08 14:16 UTCEPSS rescore
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  74. 2026-05-31 22:30 UTCEPSS rescore
  75. 2026-05-31 22:29 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-45311?
CVE-2023-45311 is a critical vulnerability published on October 6, 2023. fsevents before 1.2.11 depends on the https://fsevents-binaries.s3-us-west-2.amazonaws.com URL, which might allow an adversary to execute arbitrary code if any JavaScript project (that depends on fsevents) distributes code that was obtained from that URL at a time when it was controlled by an…
When was CVE-2023-45311 disclosed?
CVE-2023-45311 was first published in the National Vulnerability Database on October 6, 2023, 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-2023-45311 actively exploited?
CVE-2023-45311 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 27.8% of all scored CVEs.
What is the CVSS score of CVE-2023-45311?
CVE-2023-45311 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-45311?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-45311, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-45311

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