CVE-2026-13323

HIGHNVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 74% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

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

In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a Content-Security-Policy or Content-Disposition: attachment response header. An unauthenticated attacker can register a publisher account, upload a VSIX containing a crafted HTML payload, and induce an authenticated user to visit the resulting URL. The browser renders the file inline in the open-vsx.org origin context, enabling session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions. Because Open VSX extensions are distributed to VS Code, VSCodium, Cursor, Windsurf, and compatible editors, a compromised extension update constitutes a supply chain attack against all downstream users.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity87% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 6, 2026

Advisory Details (2)

Auto-updated Jul 3, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr.
generic🟡 PoC Available

Stored XSS on Open VSX Registry Leading to Publisher Account Takeover (#485) · Issues · Eclipse Projects Security / vulnerability-reports · GitLab

https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485
github_pr Patch Available

Fix: add consistent and strict http headers when serving files inside extensions

Patch available: eclipse-openvsx/openvsx cli-1.0.2 (PR #1922 merged 2026-06-23)

https://github.com/eclipse-openvsx/openvsx/pull/1922

Vendor Advisories for CVE-2026-13323(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 68× 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 184 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-10 09:34 UTCEPSS rescore
  4. 2026-09-08 22:00 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 14:42 UTCEG score recompute
  7. 2026-09-06 14:42 UTCGHSA enrichment
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-06 02:36 UTCEG score recompute
  10. 2026-09-06 02:36 UTCGHSA enrichment
  11. 2026-09-04 05:06 UTCEPSS rescore
  12. 2026-09-02 14:11 UTCEPSS rescore
  13. 2026-09-01 13:53 UTCEPSS rescore
  14. 2026-09-01 04:39 UTCEPSS rescore
  15. 2026-08-31 01:20 UTCEG score recompute
  16. 2026-08-31 01:20 UTCGHSA enrichment
  17. 2026-08-30 19:17 UTCEPSS rescore
  18. 2026-08-30 13:14 UTCEG score recompute
  19. 2026-08-30 13:14 UTCGHSA enrichment
  20. 2026-08-30 01:21 UTCEPSS rescore
  21. 2026-08-28 21:40 UTCEPSS rescore
  22. 2026-08-27 22:28 UTCEG score recompute
  23. 2026-08-27 22:28 UTCGHSA enrichment
  24. 2026-08-27 14:24 UTCEPSS rescore
  25. 2026-08-25 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-08-24 23:02 UTCEG score recompute
  2. 2026-08-24 23:02 UTCGHSA enrichment
  3. 2026-08-24 10:56 UTCEG score recompute
  4. 2026-08-24 10:56 UTCGHSA enrichment
  5. 2026-08-23 20:32 UTCGHSA enrichment
  6. 2026-08-23 08:25 UTCEG score recompute
  7. 2026-08-23 08:25 UTCGHSA enrichment
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-22 20:05 UTCGHSA enrichment
  10. 2026-08-22 07:25 UTCEG score recompute
  11. 2026-08-22 07:25 UTCGHSA enrichment
  12. 2026-08-21 23:48 UTCEPSS rescore
  13. 2026-08-21 17:17 UTCGHSA enrichment
  14. 2026-08-21 05:08 UTCEG score recompute
  15. 2026-08-21 05:08 UTCGHSA enrichment
  16. 2026-08-20 22:55 UTCEPSS rescore
  17. 2026-08-20 16:55 UTCGHSA enrichment
  18. 2026-08-20 04:48 UTCEG score recompute
  19. 2026-08-20 04:48 UTCGHSA enrichment
  20. 2026-08-19 17:03 UTCEPSS rescore
  21. 2026-08-19 09:57 UTCGHSA enrichment
  22. 2026-08-18 21:01 UTCEG score recompute
  23. 2026-08-18 21:01 UTCGHSA enrichment
  24. 2026-08-18 13:48 UTCEPSS rescore
  25. 2026-08-17 23:34 UTCEG score recompute
  26. 2026-08-17 23:34 UTCGHSA enrichment
  27. 2026-08-17 08:32 UTCGHSA enrichment
  28. 2026-08-16 20:26 UTCEG score recompute
  29. 2026-08-16 20:26 UTCGHSA enrichment
  30. 2026-08-16 14:56 UTCEPSS rescore
  31. 2026-08-16 08:19 UTCEG score recompute
  32. 2026-08-16 08:19 UTCGHSA enrichment
  33. 2026-08-16 02:14 UTCEPSS rescore
  34. 2026-08-15 20:13 UTCGHSA enrichment
  35. 2026-08-15 08:02 UTCEG score recompute
  36. 2026-08-15 08:02 UTCGHSA enrichment
  37. 2026-08-15 01:30 UTCEPSS rescore
  38. 2026-08-14 18:33 UTCGHSA enrichment
  39. 2026-08-14 06:27 UTCEG score recompute
  40. 2026-08-14 06:27 UTCGHSA enrichment
  41. 2026-08-13 22:00 UTCEPSS rescore
  42. 2026-08-13 18:21 UTCGHSA enrichment
  43. 2026-08-13 06:12 UTCGHSA enrichment
  44. 2026-08-12 18:06 UTCEG score recompute
  45. 2026-08-12 18:06 UTCGHSA enrichment
  46. 2026-08-12 13:50 UTCEPSS rescore
  47. 2026-08-12 05:59 UTCGHSA enrichment
  48. 2026-08-11 17:53 UTCEG score recompute
  49. 2026-08-11 17:53 UTCGHSA enrichment
  50. 2026-08-11 13:42 UTCEPSS rescore
  51. 2026-08-11 05:35 UTCEG score recompute
  52. 2026-08-11 05:35 UTCGHSA enrichment
  53. 2026-08-10 23:59 UTCEPSS rescore
  54. 2026-08-10 17:28 UTCGHSA enrichment
  55. 2026-08-10 05:22 UTCGHSA enrichment
  56. 2026-08-09 17:16 UTCEG score recompute
  57. 2026-08-09 17:16 UTCGHSA enrichment
  58. 2026-08-09 13:46 UTCEPSS rescore
  59. 2026-08-09 05:10 UTCGHSA enrichment
  60. 2026-08-08 17:04 UTCEG score recompute
  61. 2026-08-08 17:04 UTCGHSA enrichment
  62. 2026-08-08 16:37 UTCEPSS rescore
  63. 2026-08-08 04:57 UTCGHSA enrichment
  64. 2026-08-07 16:51 UTCEG score recompute
  65. 2026-08-07 16:51 UTCGHSA enrichment
  66. 2026-08-07 04:45 UTCGHSA enrichment
  67. 2026-08-06 16:39 UTCEG score recompute
  68. 2026-08-06 16:39 UTCGHSA enrichment
  69. 2026-08-06 13:46 UTCEPSS rescore
  70. 2026-08-06 04:30 UTCEG score recompute
  71. 2026-08-06 04:30 UTCGHSA enrichment
  72. 2026-08-05 19:17 UTCEPSS rescore
  73. 2026-08-05 16:24 UTCGHSA enrichment
  74. 2026-08-05 02:37 UTCEG score recompute
  75. 2026-08-05 02:37 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-13323?
CVE-2026-13323 is a high vulnerability published on July 1, 2026. In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a Content-Security-Policy or Content-Disposition: attachment response header. An unauthenticated attacker can register a publisher account, upload a VSIX…
When was CVE-2026-13323 disclosed?
CVE-2026-13323 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13323 actively exploited?
CVE-2026-13323 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 74.1% of all scored CVEs.
What is the CVSS score of CVE-2026-13323?
CVE-2026-13323 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-13323?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13323, 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

Explore the affected products and dependency analysis for CVE-2026-13323

Explore →

Is Your Infrastructure Affected by CVE-2026-13323?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs