Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code. Prior to 0.8.30, Markdown Preview Enhanced reads repository-controlled .crossnote/head.html content and passes it through resolvePathsInHeader before inserting it into the head of the preview webview document without removing executable content. Script-capable markup executes while the document loads, before the React application and DOMPurify initialize, and can access acquireVsCodeApi to send messages from the webview to the extension host. Opening a Markdown preview in a malicious repository is sufficient to trigger the injected content, and no additional click within the notification or preview is required. This issue is fixed in version 0.8.30.
CVE-2026-54701
MEDIUMPre-NVD 6.96.9Trending — 3 sources updated this weekElevatedEG-KEV Tier 3: ElevatedEG-KEV is EchelonGraph's own tiering of exploitation signals from CISA KEV, CISA's SSVC data (Vulnrichment), ransomware data, public exploit-code references and EPSS.Tier 3 is not evidence of exploitation. It means public exploit code is referenced, or CISA's SSVC data says "public PoC", or EPSS ranks the CVE in the top 5%.Signals for this CVE: CISA's SSVC exploitation value: public PoC.EchelonGraph confidence 38%: a heuristic from the tier and the number of signals, not a measured probability.
EchelonGraph scoreMEDIUM confidence
“—” beside the score: it is equal to the CVSS score beside it.
This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (22nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Also known asEUVD-2026-101584 (ENISA EUVD)Source: ENISA EUVD
6.9EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
- CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.9Exploit: No code on recordExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 6.9
- EG Score
- 6.9MEDIUMmedium confidence
- EG Risk
- 47EG Risk 47/100
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)Severity69% × 45%Impact severity (EG Severity): CVSS 6.9 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation public PoC (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
- 22nd
- 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 (6.9): severity, escalated by confirmed exploitation. This CVE's 6.9 is its impact severity (EG Severity), not escalated.
- EG Severity
- 6.9 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
- EG Likelihood
- 0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). 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 low or medium mission impact; Track* at high (mission-essential systems).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 low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation public PoC (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
October 14, 2026
Last Modified
October 20, 2026
Advisory Details (7)
Auto-updated Oct 14, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github, github_pr.
GitHub release Patch Available
0.8.30
Patch available: shd101wyy/vscode-markdown-preview-enhanced 0.8.30
https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.30GitHub release Patch Available
0.9.31
Patch available: shd101wyy/crossnote 0.9.31
https://github.com/shd101wyy/crossnote/releases/tag/0.9.31GitHub commit Patch Available
commit 8bc848b6cbb4 (shd101wyy/vscode-markdown-preview-enhanced)
Patch available: shd101wyy/vscode-markdown-preview-enhanced 0.8.30 (contains commit 8bc848b6cbb4)
https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/8bc848b6cbb42b9f35a0f95f7c3bf29b8302970eGitHub commit Patch Available
commit 8c55a2ba3365 (shd101wyy/crossnote)
Patch available: shd101wyy/crossnote 0.9.31 (contains commit 8c55a2ba3365)
https://github.com/shd101wyy/crossnote/commit/8c55a2ba3365712a1caa4abeece0383bc2994d48GitHub pull request Patch Available
0.8.30
Patch available: shd101wyy/vscode-markdown-preview-enhanced 0.8.30 (PR #2323 merged 2026-06-08)
https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2323GitHub pull request Patch Available
0.9.31
Patch available: shd101wyy/crossnote 0.9.31 (PR #444 merged 2026-06-08)
https://github.com/shd101wyy/crossnote/pull/444GitHub advisoryMentions a patch (unverified)🟡 PoC Available
Stored XSS via Unsanitized `.crossnote/head.html` Injection in Webview · Advisory · shd101wyy/vscode-markdown-preview-enhanced · GitHub
https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-mcwg-4j78-qwv3Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 24× 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.
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-29 14:42 UTCEG score recompute
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-28 15:25 UTCOSV refresh
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-25 14:19 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-20 03:26 UTCEG score recompute
- 2026-10-20 02:35 UTCEG score recompute
- 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-18 03:30 UTCEG score recompute
- 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-16 16:14 UTCEG score recompute
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
- 2026-10-14 20:44 UTCEG score recompute
- 2026-10-14 19:28 UTCEG score recomputeFirst assessed: 6.9 MEDIUM
- 2026-10-14 19:24 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-54701?
CVE-2026-54701 is a medium-severity vulnerability; its CVE record was published on October 14, 2026. Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code. Prior to 0.8.30, Markdown Preview Enhanced reads repository-controlled .crossnote/head.html content and passes it through resolvePathsInHeader before inserting it into the head of the preview webview document without…
When was the CVE record for CVE-2026-54701 published?
The CVE record for CVE-2026-54701 was published on October 14, 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 20, 2026; the record at its source may have been updated since.
Is CVE-2026-54701 actively exploited?
CVE-2026-54701 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54701?
CVE-2026-54701 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54701?
A fix for CVE-2026-54701 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-54701
Is Your Infrastructure Affected by CVE-2026-54701?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.