CVE-2026-34373

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 90% 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
Trending — 3 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

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

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.66 and 9.7.0-alpha.10, the GraphQL API endpoint does not respect the allowOrigin server option and unconditionally allows cross-origin requests from any website. This bypasses origin restrictions that operators configure to control which websites can interact with the Parse Server API. The REST API correctly enforces the configured allowOrigin restriction. This issue has been patched in versions 8.6.66 and 9.7.0-alpha.10.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
10.3%
KEV
Not listed

Published

March 31, 2026

Last Modified

April 2, 2026

Advisory Details (5)

Auto-updated Jun 7, 2026
Patch available. Sources: github_commit, github_pr, github.
github Patch Available

GraphQL API endpoint ignores CORS origin restriction · Advisory · parse-community/parse-server · GitHub

https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829c
github_pr Patch Available

fix: GraphQL API endpoint ignores CORS origin restriction (GHSA-q3p6-g7c4-829c)

Patch available: parse-community/parse-server 8.6.74 (PR #10335 merged 2026-03-27)

https://github.com/parse-community/parse-server/pull/10335
github_pr Patch Available

fix: GraphQL API endpoint ignores CORS origin restriction (GHSA-q3p6-g7c4-829c)

Patch available: parse-community/parse-server 9.8.0-alpha.4 (PR #10334 merged 2026-03-27)

https://github.com/parse-community/parse-server/pull/10334
github_commit Patch Available

commit 4dd0d3d8be1c (parse-community/parse-server)

Patch available: parse-community/parse-server 9.8.0-alpha.4 (contains commit 4dd0d3d8be1c)

https://github.com/parse-community/parse-server/commit/4dd0d3d8be1c39664c74ad10bb0abaa76bc41203
github_commit Patch Available

commit 034764150789 (parse-community/parse-server)

Patch available: parse-community/parse-server 8.6.74 (contains commit 034764150789)

https://github.com/parse-community/parse-server/commit/0347641507891d0013ec57f7c10f012064f41263

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
parse-server—8.6.66—

Data Freshness Timeline

(refreshed 9× in last 7d / 39× 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. 2026-07-23 03:09 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
  5. 2026-07-19 14:31 UTCEPSS rescore
  6. 2026-07-19 02:29 UTCEPSS rescore
  7. 2026-07-18 10:04 UTCEPSS rescore
  8. 2026-07-17 04:54 UTCOSV refresh
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  1. 2026-06-30 23:22 UTCEPSS rescore
  2. 2026-06-29 14:06 UTCEPSS rescore
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-29 03:02 UTCOSV refresh
  5. 2026-06-28 14:07 UTCEPSS rescore
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  7. 2026-06-28 04:56 UTCEPSS rescore
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  9. 2026-06-27 03:08 UTCEPSS rescore
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  17. 2026-06-21 14:56 UTCEPSS rescore
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  22. 2026-06-18 17:52 UTCEPSS rescore
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  24. 2026-06-17 17:53 UTCEPSS rescore
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  26. 2026-06-15 17:49 UTCEPSS rescore
  27. 2026-06-14 23:18 UTCEPSS rescore
  28. 2026-06-13 23:00 UTCEPSS rescore
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  31. 2026-06-11 14:00 UTCEPSS rescore
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  36. 2026-06-07 15:25 UTCEPSS rescore
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  39. 2026-06-06 13:47 UTCEPSS rescore
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  43. 2026-06-05 06:10 UTCEPSS rescore
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  45. 2026-06-04 13:12 UTCEPSS rescore
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  47. 2026-06-02 20:13 UTCEPSS rescore
  48. 2026-06-01 13:52 UTCEPSS rescore
  49. 2026-06-01 13:52 UTCEPSS rescore
  50. 2026-06-01 13:51 UTCEPSS rescore
  51. 2026-06-01 05:13 UTCOSV refresh
  52. 2026-05-31 22:30 UTCEPSS rescore
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  54. 2026-05-31 00:16 UTCEPSS rescore
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  57. 2026-05-29 13:44 UTCEPSS rescore
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  68. 2026-05-20 22:38 UTCEPSS rescore
  69. 2026-05-20 22:38 UTCEPSS rescore
  70. 2026-05-20 19:48 UTCEG score recompute
  71. 2026-05-20 11:22 UTCEPSS rescore
  72. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-34373?
CVE-2026-34373 is a high vulnerability published on March 31, 2026. Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.66 and 9.7.0-alpha.10, the GraphQL API endpoint does not respect the allowOrigin server option and unconditionally allows cross-origin requests from any website. This…
When was CVE-2026-34373 disclosed?
CVE-2026-34373 was first published in the National Vulnerability Database on March 31, 2026, with the most recent update on April 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34373 actively exploited?
CVE-2026-34373 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34373?
CVE-2026-34373 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-34373?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34373, 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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