CVE-2026-13323

HIGHNVD 8.78.7
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.3% (26th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 4.1 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-07-01) is not newer than that change (2026-10-25), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-40945 (ENISA EUVD) · GHSA-f3mc-x4vf-jrw2 (GitHub Security Advisories)Source: ENISA EUVD

8.7EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
8.7HIGHmedium confidence
EG Risk
39
EG Risk 39/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity87% × 45%
Impact severity (EG Severity): CVSS 8.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
26th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.7): severity, escalated by confirmed exploitation. This CVE's 8.7 is its impact severity (EG Severity), not escalated.

EG Severity
8.7 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 1, 2026

Last Modified

October 25, 2026

Advisory Details (2)

Auto-updated Jul 3, 2026
Patch available. Sources: github_pr.
Web page

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 pull request 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 12× in last 7d / 42× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 246 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 146 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  2. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  3. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  4. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  5. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  6. 2026-10-25 17:32 UTCEG score recompute
  7. 2026-10-25 17:32 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  8. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-10-25 14:49 UTCEG score recompute
  10. 2026-10-24 21:30 UTCEG score recompute
  11. 2026-10-24 21:30 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  12. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  13. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  14. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  15. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  17. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  18. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  19. 2026-10-18 05:03 UTCEG score recompute
  20. 2026-10-17 18:40 UTCEG score recompute
  21. 2026-10-17 18:40 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  22. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  23. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  24. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
Show 75 more
  1. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  2. 2026-10-13 16:24 UTCOSV refresh
  3. 2026-10-12 16:35 UTCEG score recompute
  4. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  5. 2026-10-11 20:11 UTCEG score recompute
  6. 2026-10-11 18:23 UTCEG score recompute
  7. 2026-10-11 14:57 UTCEG score recompute
  8. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  9. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  10. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  11. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  12. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  13. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  14. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  15. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  16. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  17. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  18. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  19. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  20. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  21. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  22. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  23. 2026-09-23 06:56 UTCEG score recompute
  24. 2026-09-23 06:56 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  25. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  26. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  27. 2026-09-18 06:37 UTCEG score recompute
  28. 2026-09-18 06:37 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  29. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  30. 2026-09-14 00:27 UTCEG score recompute
  31. 2026-09-14 00:27 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  32. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  33. 2026-09-13 09:09 UTCEG score recompute
  34. 2026-09-13 09:09 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  35. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  36. 2026-09-12 14:50 UTCEG score recompute
  37. 2026-09-12 14:50 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  38. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  39. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  40. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  41. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  42. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  43. 2026-09-06 14:42 UTCEG score recompute
  44. 2026-09-06 14:42 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  45. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  46. 2026-09-06 02:36 UTCEG score recompute
  47. 2026-09-06 02:36 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  48. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  49. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  50. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  51. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  52. 2026-08-31 01:20 UTCEG score recompute
  53. 2026-08-31 01:20 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  54. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  55. 2026-08-30 13:14 UTCEG score recompute
  56. 2026-08-30 13:14 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  57. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  58. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  59. 2026-08-27 22:28 UTCEG score recompute
  60. 2026-08-27 22:28 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  61. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  62. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  63. 2026-08-24 23:02 UTCEG score recompute
  64. 2026-08-24 23:02 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  65. 2026-08-24 10:56 UTCEG score recompute
  66. 2026-08-24 10:56 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  67. 2026-08-23 20:32 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  68. 2026-08-23 08:25 UTCEG score recompute
  69. 2026-08-23 08:25 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  70. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  71. 2026-08-22 20:05 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  72. 2026-08-22 07:25 UTCEG score recompute
  73. 2026-08-22 07:25 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1
  74. 2026-08-21 23:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  75. 2026-08-21 17:17 UTCGHSA enrichmentGHSA-f3mc-x4vf-jrw2 · GitHub CVSS 4.1

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13323?
CVE-2026-13323 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-13323 published?
The CVE record for CVE-2026-13323 was published on July 1, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 25, 2026; the record at its source may have been updated since.
Is CVE-2026-13323 actively exploited?
CVE-2026-13323 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (26th percentile of EPSS-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?
A fix for CVE-2026-13323 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-13323 are linked in the Vendor Advisories panel on this page.

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