CVE-2026-53633

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 55% 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, secondary
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

Vitest is a testing framework powered by Vite. From 3.0.0 until 3.2.5, 4.1.8, and 5.0.0-beta.4, Vitest Browser Mode exposed a cdp() API that forwarded raw Chrome DevTools Protocol methods without being gated by allowWrite or allowExec, allowing a remote client with exposed browser API metadata to use CDP Page.setDownloadBehavior and Runtime.evaluate to overwrite vite.config.ts and execute attacker-controlled Node.js code. This issue is fixed in versions 3.2.5, 4.1.8, and 5.0.0-beta.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

June 15, 2026

Last Modified

July 29, 2026

Advisory Details (10)

Auto-updated Aug 12, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github, github_commit.
github Patch Available🟡 PoC Available

Exposed Browser Mode API Can Proxy CDP and Overwrite Config Files, Leading to RCE · Advisory · vitest-dev/vitest · GitHub

https://github.com/vitest-dev/vitest/security/advisories/GHSA-g8mr-85jm-7xhm
github_release Patch Available

v5.0.0-beta.4

Patch available: vitest-dev/vitest v5.0.0-beta.4 (pre-release)

https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.4
github_release Patch Available

v4.1.8

Patch available: vitest-dev/vitest v4.1.8

https://github.com/vitest-dev/vitest/releases/tag/v4.1.8
github_release Patch Available

v3.2.5

Patch available: vitest-dev/vitest v3.2.5

https://github.com/vitest-dev/vitest/releases/tag/v3.2.5
github_pr Patch Available

fix(browser): disable client `cdp` API when `allowWrite/allowExec: false` [backport to v3]

Patch available: vitest-dev/vitest v3.2.5 (PR #10456 merged 2026-05-28)

https://github.com/vitest-dev/vitest/pull/10456
github_pr Patch Available

fix(browser): disable client `cdp` API when `allowWrite/allowExec: false` [backport to v4]

Patch available: vitest-dev/vitest v4.1.8 (PR #10450 merged 2026-05-28)

https://github.com/vitest-dev/vitest/pull/10450
github_pr Patch Available

fix(browser): disable client `cdp` API when `allowWrite/allowExec: false`

Patch available: vitest-dev/vitest v5.0.0-beta.4 (PR #10444 merged 2026-05-28)

https://github.com/vitest-dev/vitest/pull/10444
github_commit Patch Available

commit e4067b3b1500 (vitest-dev/vitest)

Patch available: vitest-dev/vitest v4.1.8 (contains commit e4067b3b1500)

https://github.com/vitest-dev/vitest/commit/e4067b3b150005fd42cf75f994300119245806b9
github_commit Patch Available

commit 63e3b2eee4d5 (vitest-dev/vitest)

Patch available: vitest-dev/vitest v5.0.0-beta.4 (contains commit 63e3b2eee4d5)

https://github.com/vitest-dev/vitest/commit/63e3b2eee4d58da56786a6333f517b9b492528c7
github_commit Patch Available

commit 385a1aefd4c2 (vitest-dev/vitest)

Patch available: vitest-dev/vitest v3.2.5 (contains commit 385a1aefd4c2)

https://github.com/vitest-dev/vitest/commit/385a1aefd4c2bfa5e7d58bf7c6834c929969f2c7

Vendor Advisories for CVE-2026-53633(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 1 ecosystem)
npm(2)
PackageVulnerable rangeFixed inDependents
vite-plus—0.1.24—
@vitest/browser—3.2.5—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 51× 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. 2026-08-15 03:58 UTCEG score recompute
  2. 2026-08-15 01:30 UTCEPSS rescore
  3. 2026-08-13 22:04 UTCEG score recompute
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-12 16:18 UTCEG score recompute
  6. 2026-08-12 13:51 UTCEPSS rescore
  7. 2026-08-11 14:14 UTCEG score recompute
  8. 2026-08-11 03:03 UTCEG score recompute
  9. 2026-08-11 00:00 UTCEPSS rescore
  10. 2026-08-09 16:48 UTCEG score recompute
  11. 2026-08-09 13:46 UTCEPSS rescore
  12. 2026-08-08 18:28 UTCEG score recompute
  13. 2026-08-08 16:37 UTCEPSS rescore
  14. 2026-08-07 20:09 UTCEG score recompute
  15. 2026-08-06 14:23 UTCEG score recompute
  16. 2026-08-06 13:47 UTCEPSS rescore
  17. 2026-08-05 19:41 UTCEG score recompute
  18. 2026-08-05 19:17 UTCEPSS rescore
  19. 2026-08-04 15:42 UTCEG score recompute
  20. 2026-08-04 15:10 UTCEPSS rescore
  21. 2026-08-04 10:39 UTCEPSS rescore
  22. 2026-08-03 14:44 UTCEG score recompute
  23. 2026-08-03 10:36 UTCEPSS rescore
  24. 2026-08-02 03:37 UTCEG score recompute
  25. 2026-08-02 02:27 UTCEPSS rescore
Show 29 more
  1. 2026-08-01 08:50 UTCEG score recompute
  2. 2026-08-01 04:16 UTCEPSS rescore
  3. 2026-07-30 23:54 UTCEG score recompute
  4. 2026-07-30 16:28 UTCEPSS rescore
  5. 2026-07-30 09:23 UTCEG score recompute
  6. 2026-07-30 05:11 UTCEG score recompute
  7. 2026-07-30 01:30 UTCEPSS rescore
  8. 2026-07-29 19:41 UTCEG score recompute
  9. 2026-07-29 18:34 UTCEG score recompute
  10. 2026-07-29 03:24 UTCEG score recompute
  11. 2026-07-28 15:37 UTCEPSS rescore
  12. 2026-07-27 18:18 UTCEG score recompute
  13. 2026-07-26 20:13 UTCEG score recompute
  14. 2026-07-26 14:54 UTCEPSS rescore
  15. 2026-07-25 14:18 UTCEPSS rescore
  16. 2026-07-24 14:18 UTCEPSS rescore
  17. 2026-07-23 14:18 UTCEPSS rescore
  18. 2026-07-23 03:19 UTCEG score recompute
  19. 2026-07-22 14:08 UTCEPSS rescore
  20. 2026-07-21 15:25 UTCEPSS rescore
  21. 2026-07-20 17:08 UTCEPSS rescore
  22. 2026-07-19 14:31 UTCEPSS rescore
  23. 2026-07-19 14:31 UTCEPSS rescore
  24. 2026-07-19 02:29 UTCEPSS rescore
  25. 2026-07-18 10:04 UTCEPSS rescore
  26. 2026-07-16 17:03 UTCEPSS rescore
  27. 2026-07-15 16:57 UTCEPSS rescore
  28. 2026-07-15 16:57 UTCEPSS rescore
  29. 2026-06-15 20:11 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-53633?
CVE-2026-53633 is a critical vulnerability published on June 15, 2026. Vitest is a testing framework powered by Vite. From 3.0.0 until 3.2.5, 4.1.8, and 5.0.0-beta.4, Vitest Browser Mode exposed a cdp() API that forwarded raw Chrome DevTools Protocol methods without being gated by allowWrite or allowExec, allowing a remote client with exposed browser API metadata to…
When was CVE-2026-53633 disclosed?
CVE-2026-53633 was first published in the National Vulnerability Database on June 15, 2026, with the most recent update on July 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53633 actively exploited?
CVE-2026-53633 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.3% of all scored CVEs.
What is the CVSS score of CVE-2026-53633?
CVE-2026-53633 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-53633?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53633, 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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