CVE-2026-78208

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-24. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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

exceljs through 4.4.0 contains a path traversal vulnerability in the Workbook.addImage() function that fails to validate file paths. Attackers can supply arbitrary file paths to read any file accessible to the Node.js process and embed it in the generated workbook.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
41st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 24, 2026

Last Modified

August 31, 2026

Advisory Details (5)

Auto-updated Aug 24, 2026
No fix on record yet. Sources: github.
generic

exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename | Advisories | VulnCheck

https://www.vulncheck.com/advisories/exceljs-through-path-traversal-via-unvalidated-addimage-filename
generic

exceljs/lib/xlsx/xlsx.js at v4.4.0 · exceljs/exceljs · GitHub

https://github.com/exceljs/exceljs/blob/v4.4.0/lib/xlsx/xlsx.js#L421-L429
generic

exceljs/lib/doc/workbook.js at v4.4.0 · exceljs/exceljs · GitHub

https://github.com/exceljs/exceljs/blob/v4.4.0/lib/doc/workbook.js#L142-L147
githubMentions a patch (unverified)

Path Traversal in exceljs via `Workbook.addImage({filename})` · Advisory · mateocallec/exceljs-hardened · GitHub

https://github.com/mateocallec/exceljs-hardened/security/advisories/GHSA-m8mg-8574-gm3m
generic

GitHub - exceljs/exceljs: Excel Workbook Manager · GitHub

https://github.com/exceljs/exceljs

Vendor Advisories for CVE-2026-78208(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 24× in last 7d / 110× 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 189 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-78208?
CVE-2026-78208 is a high vulnerability published on August 24, 2026. exceljs through 4.4.0 contains a path traversal vulnerability in the Workbook.addImage() function that fails to validate file paths. Attackers can supply arbitrary file paths to read any file accessible to the Node.js process and embed it in the generated workbook.
When was CVE-2026-78208 disclosed?
CVE-2026-78208 was first published on August 24, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78208 actively exploited?
CVE-2026-78208 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-78208?
CVE-2026-78208 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-78208?
No fix for CVE-2026-78208 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-2026-78208 are linked in the Vendor Advisories panel on this page.

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