CVE-2026-54520

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd 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-2026-82577 (ENISA EUVD)Source: ENISA EUVD

8.1EG
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: 0.5%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

AI Agent Automation is a modular AI agent workflow automation platform with schedulers, tools, and observability. Prior to 0.9.1, the executeStep file-step implementation in backend/src/agents/executor.js passes the user-controlled step.path value through path.resolve with process.cwd() and then uses the resulting path for read or write operations without checking that it remains in an approved workflow directory. An authenticated user who can create or modify workflow file steps can supply traversal segments to escape the intended workspace and read sensitive files or write and overwrite files accessible to the backend process, including application-adjacent files when process permissions allow. This issue is fixed in version 0.9.1.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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)
Severity81% × 45%
Impact severity (EG Severity): CVSS 8.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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
0.5%
EPSS %ILE
42nd
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 (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.

EG Severity
8.1 HIGHCVSS-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
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). 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: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: 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 none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (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

September 17, 2026

Last Modified

September 24, 2026

Advisory Details (3)

Auto-updated Sep 17, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub advisoryMentions a patch (unverified)

Workflow file step path traversal allows read and write outside the expected directory · Advisory · vmDeshpande/ai-agent-automation · GitHub

https://github.com/vmDeshpande/ai-agent-automation/security/advisories/GHSA-cm8g-8jfq-887p
GitHub release Patch Available

v0.9.1 - Security Update

Patch available: vmDeshpande/ai-agent-automation v0.9.1

https://github.com/vmDeshpande/ai-agent-automation/releases/tag/v0.9.1
GitHub commit Patch Available

commit f49ec7e85a68 (vmDeshpande/ai-agent-automation)

Patch available: vmDeshpande/ai-agent-automation v0.9.1 (contains commit f49ec7e85a68)

https://github.com/vmDeshpande/ai-agent-automation/commit/f49ec7e85a6896b14c275222362e6ce4d445b783

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 47× 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.

  1. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  4. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-10-30 16:10 UTCEG score recompute
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-10-25 14:19 UTCEG score recompute
  12. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-23 22:14 UTCEG score recompute
  14. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  15. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  16. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  17. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-18 03:30 UTCEG score recompute
  21. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-10-17 04:10 UTCEG score recompute
  23. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
Show 55 more
  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:18 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-10-11 02:50 UTCEG score recompute
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-10 01:17 UTCEG score recompute
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-10-08 22:59 UTCEG score recompute
  13. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-08 11:07 UTCEG score recompute
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-06 23:29 UTCEG score recompute
  17. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-10-05 23:45 UTCEG score recompute
  19. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-04 23:39 UTCEG score recompute
  21. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-10-03 23:54 UTCEG score recompute
  23. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-10-03 00:09 UTCEG score recompute
  25. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  26. 2026-10-02 00:20 UTCEG score recompute
  27. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  28. 2026-10-01 00:36 UTCEG score recompute
  29. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  30. 2026-09-30 00:42 UTCEG score recompute
  31. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  32. 2026-09-29 08:32 UTCEG score recompute
  33. 2026-09-28 20:39 UTCEG score recompute
  34. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  35. 2026-09-27 20:55 UTCEG score recompute
  36. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  37. 2026-09-26 21:10 UTCEG score recompute
  38. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  39. 2026-09-26 09:19 UTCEG score recompute
  40. 2026-09-24 18:02 UTCEG score recompute
  41. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  42. 2026-09-23 18:10 UTCEG score recompute
  43. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  44. 2026-09-22 18:25 UTCEG score recompute
  45. 2026-09-22 06:33 UTCEG score recompute
  46. 2026-09-21 06:49 UTCEG score recompute
  47. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  48. 2026-09-19 19:13 UTCEG score recompute
  49. 2026-09-19 07:20 UTCEG score recompute
  50. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  51. 2026-09-18 19:28 UTCEG score recompute
  52. 2026-09-18 18:44 UTCEG score recompute
  53. 2026-09-17 22:23 UTCEG score recompute
  54. 2026-09-17 22:09 UTCEG score recomputeFirst assessed: 8.1 HIGH
  55. 2026-09-17 22:09 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-54520?
CVE-2026-54520 is a high-severity vulnerability; its CVE record was published on September 17, 2026. AI Agent Automation is a modular AI agent workflow automation platform with schedulers, tools, and observability. Prior to 0.9.1, the executeStep file-step implementation in backend/src/agents/executor.js passes the user-controlled step.path value through path.resolve with process.cwd() and then…
When was the CVE record for CVE-2026-54520 published?
The CVE record for CVE-2026-54520 was published on September 17, 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 September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-54520 actively exploited?
CVE-2026-54520 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54520?
CVE-2026-54520 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54520?
A fix for CVE-2026-54520 is available: update to the fixed version the vendor names in its advisory.

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