CVE-2026-74234

✕ Withdrawn — historical dataHIGHPre-NVD 7.7
7.7CVSS
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.7Exploit: None knownExposed services: Not assessed

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

Legora before 2026-08-14 contains a cross-site scripting vulnerability that allows attackers to achieve arbitrary JavaScript execution in a victim's browser by embedding a Mermaid block prefixed with a gray-matter JavaScript front-matter directive, causing the front-matter parser to invoke eval() before any SVG sanitization occurs. Attackers can exploit this flaw through influenced Mermaid diagram content to execute arbitrary JavaScript in the user's browser context, with elevated impact on Word and Outlook add-in surfaces where bearer session tokens are persisted in localStorage.

CVSS v3
7.7
EchelonGraph score
Not yet assessedThis CVE record was withdrawn by its numbering authority, so there is no vulnerability to rate.
EG Score
—
EG Risk
—
EPSS PROB
0.3%
EPSS %ILE
19th
KEV
Not listed

Published

August 17, 2026

Last Modified

August 21, 2026

Advisory Details (2)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

Legora < 2026-08-14 XSS via Mermaid gray-matter JavaScript Engine | Advisories | VulnCheck

https://www.vulncheck.com/advisories/legora-2026-08-14-xss-via-mermaid-gray-matter-javascript-engine
generic

Legora

https://legora.com/

Vendor Advisories for CVE-2026-74234(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 3× in last 7d / 10× 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. 2026-10-05 06:56 UTCGHSA enrichment
  2. 2026-10-02 01:33 UTCEG score recompute
  3. 2026-10-02 01:33 UTCGHSA enrichment
  4. 2026-09-28 11:54 UTCGHSA enrichment
  5. 2026-09-25 06:30 UTCGHSA enrichment
  6. 2026-09-22 01:08 UTCGHSA enrichment
  7. 2026-09-18 19:45 UTCGHSA enrichment
  8. 2026-09-15 14:23 UTCGHSA enrichment
  9. 2026-09-12 09:01 UTCGHSA enrichment
  10. 2026-09-09 03:38 UTCGHSA enrichment
  11. 2026-09-05 10:49 UTCGHSA enrichment
  12. 2026-09-02 05:25 UTCGHSA enrichment
  13. 2026-08-30 00:03 UTCGHSA enrichment
  14. 2026-08-26 18:40 UTCEG score recompute▼ 7.70
  15. 2026-08-26 18:40 UTCGHSA enrichment
  16. 2026-08-26 14:47 UTCEPSS rescore
  17. 2026-08-26 05:29 UTCGHSA enrichment
  18. 2026-08-25 16:21 UTCEG score recompute
  19. 2026-08-25 16:21 UTCGHSA enrichment
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-25 03:13 UTCEG score recompute
  22. 2026-08-25 03:13 UTCGHSA enrichment
  23. 2026-08-24 14:18 UTCEPSS rescore
  24. 2026-08-24 14:05 UTCEG score recompute
  25. 2026-08-24 14:05 UTCGHSA enrichment
Show 30 more
  1. 2026-08-24 00:57 UTCGHSA enrichment
  2. 2026-08-23 11:46 UTCEG score recompute
  3. 2026-08-23 11:46 UTCGHSA enrichment
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-22 22:39 UTCGHSA enrichment
  6. 2026-08-22 09:31 UTCEG score recompute
  7. 2026-08-22 09:31 UTCGHSA enrichment
  8. 2026-08-21 23:49 UTCEPSS rescore
  9. 2026-08-21 20:23 UTCEG score recompute
  10. 2026-08-21 20:23 UTCGHSA enrichment
  11. 2026-08-21 19:59 UTCEG score recompute
  12. 2026-08-21 19:59 UTCGHSA enrichment
  13. 2026-08-21 16:31 UTCGHSA enrichment
  14. 2026-08-21 03:23 UTCEG score recompute
  15. 2026-08-21 03:23 UTCGHSA enrichment
  16. 2026-08-20 22:56 UTCEPSS rescore
  17. 2026-08-20 14:15 UTCGHSA enrichment
  18. 2026-08-20 01:03 UTCEG score recompute
  19. 2026-08-20 01:03 UTCGHSA enrichment
  20. 2026-08-19 17:04 UTCEPSS rescore
  21. 2026-08-19 11:54 UTCGHSA enrichment
  22. 2026-08-18 22:46 UTCEG score recompute
  23. 2026-08-18 22:46 UTCGHSA enrichment
  24. 2026-08-18 13:49 UTCEPSS rescore
  25. 2026-08-18 13:49 UTCEPSS rescore
  26. 2026-08-18 09:36 UTCEG score recompute
  27. 2026-08-18 09:36 UTCGHSA enrichment
  28. 2026-08-17 20:29 UTCEG score recompute
  29. 2026-08-17 19:50 UTCEG score recompute
  30. 2026-08-17 19:49 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-74234?
CVE-2026-74234 is a high vulnerability published on August 17, 2026. Legora before 2026-08-14 contains a cross-site scripting vulnerability that allows attackers to achieve arbitrary JavaScript execution in a victim's browser by embedding a Mermaid block prefixed with a gray-matter JavaScript front-matter directive, causing the front-matter parser to invoke eval()…
When was CVE-2026-74234 disclosed?
CVE-2026-74234 was first published on August 17, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74234 actively exploited?
CVE-2026-74234 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74234?
CVE-2026-74234 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-74234?
No fix for CVE-2026-74234 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-74234 are linked in the Vendor Advisories panel on this page.

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