CVE-2025-50864

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 93% 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
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

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

An Origin Validation Error in the elysia-cors library thru 1.3.0 allows attackers to bypass Cross-Origin Resource Sharing (CORS) restrictions. The library incorrectly validates the supplied origin by checking if it is a substring of any domain in the site's CORS policy, rather than performing an exact match. For example, a malicious origin like "notexample.com", "example.common.net" is whitelisted when the site's CORS policy specifies "example.com." This vulnerability enables unauthorized access to user data on sites using the elysia-cors library for CORS validation.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
35.6%
KEV
Not listed

Published

August 20, 2025

Last Modified

July 5, 2026

Advisory Details (3)

Auto-updated Jul 8, 2026
Patch available. Sources: github_commit.
generic

GitHub - elysiajs/elysia-cors: Plugin for Elysia that for Cross Origin Requests (CORs) · GitHub

https://github.com/elysiajs/elysia-cors/tree/main
github_commit Patch Available

commit 9b9eb92e32a7 (elysiajs/elysia-cors)

Patch available: elysiajs/elysia-cors 1.3.1 (contains commit 9b9eb92e32a7)

https://github.com/elysiajs/elysia-cors/commit/9b9eb92e32a7a4b43b6d5108668941701c33e221
generic

elysia-cors/src/index.ts at main · elysiajs/elysia-cors · GitHub

https://github.com/elysiajs/elysia-cors/blob/main/src/index.ts

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@elysiajs/cors—1.3.1—

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 110 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-10 07:31 UTCOSV refresh
  4. 2026-07-09 19:09 UTCEPSS rescore
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  1. 2026-06-25 13:49 UTCEPSS rescore
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  8. 2026-06-21 18:12 UTCOSV refresh
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  27. 2026-06-10 22:18 UTCEPSS rescore
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  43. 2026-06-02 19:02 UTCOSV refresh
  44. 2026-06-01 13:51 UTCEPSS rescore
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  67. 2026-05-24 16:57 UTCEPSS rescore
  68. 2026-05-23 15:20 UTCEPSS rescore
  69. 2026-05-23 00:09 UTCEG score recompute
  70. 2026-05-22 21:16 UTCEPSS rescore
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  73. 2026-05-21 22:43 UTCEPSS rescore
  74. 2026-05-21 22:43 UTCEPSS rescore
  75. 2026-05-21 09:27 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-50864?
CVE-2025-50864 is a medium vulnerability published on August 20, 2025. An Origin Validation Error in the elysia-cors library thru 1.3.0 allows attackers to bypass Cross-Origin Resource Sharing (CORS) restrictions. The library incorrectly validates the supplied origin by checking if it is a substring of any domain in the site's CORS policy, rather than performing an…
When was CVE-2025-50864 disclosed?
CVE-2025-50864 was first published in the National Vulnerability Database on August 20, 2025, with the most recent update on July 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-50864 actively exploited?
CVE-2025-50864 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-50864?
CVE-2025-50864 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-50864?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-50864, 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

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