CVE-2026-40521

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-29. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Trending — 3 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

FrontAccounting before 2.4.20 contains a path traversal vulnerability in the attachment upload handler that allows authenticated attackers to execute arbitrary code by uploading files with traversal sequences in the unique_name parameter. Attackers can supply path traversal sequences ../../../shell.php to write files outside the intended attachments directory into the web root, and by uploading PHP files without extension validation, achieve remote code execution as the web server user.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
60%
KEV
Not listed

Published

June 29, 2026

Last Modified

July 14, 2026

Advisory Details (4)

Auto-updated Jun 29, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

FrontAccounting < 2.4.20 Path Traversal RCE via attachment upload | Advisories | VulnCheck

https://www.vulncheck.com/advisories/frontaccounting-path-traversal-rce-via-attachment-upload
generic

FrontAccounting / News: Release 2.4.20

https://sourceforge.net/p/frontaccounting/news/2026/04/release-2420/
generic

FrontAccounting RCE: When htmlspecialchars Meets Path Traversal — Jiva Security

https://jivasecurity.com/writeups/frontaccounting-rce-attachment-upload-cve-2026-40521
github_commit

commit 701fea6848da (FrontAccountingERP/FA)

Fix landed in FrontAccountingERP/FA commit 701fea6848da — awaiting tagged release

https://github.com/FrontAccountingERP/FA/commit/701fea6848da4a02fb83d30f07a9c0473d6b7e33

Vendor Advisories for CVE-2026-40521(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 8× in last 7d / 61× 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 198 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-40521?
CVE-2026-40521 is a high vulnerability published on June 29, 2026. FrontAccounting before 2.4.20 contains a path traversal vulnerability in the attachment upload handler that allows authenticated attackers to execute arbitrary code by uploading files with traversal sequences in the unique_name parameter. Attackers can supply path traversal sequences…
When was CVE-2026-40521 disclosed?
CVE-2026-40521 was first published in the National Vulnerability Database on June 29, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40521 actively exploited?
CVE-2026-40521 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 39.9% of all scored CVEs.
What is the CVSS score of CVE-2026-40521?
CVE-2026-40521 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-40521?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40521, 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-2026-40521

Explore →

Is Your Infrastructure Affected by CVE-2026-40521?

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

Start Free Scan →Browse All CVEs