CVE-2026-56660

CRITICALPre-NVD 9.19.1
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (44th 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
Elevated

Also known asEUVD-2026-91016 (ENISA EUVD)Source: ENISA EUVD

9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (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: 0.5%CVSS: 9.1Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the community edition of that CMS. Prior to version 1.5, the update handler in UpdateCE.php downloads a ZIP archive and extracts its contents into the web root without validating file types or extraction paths. Because PHP files are written into a web-accessible directory, an attacker who can cause a malicious archive to be processed achieves remote code execution as the web-server user. Entry names are also used unsafely, allowing directory traversal (../) to write files outside the intended extraction directory. This issue has been patched in version 1.5.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

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)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 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, Track* at medium and Attend at high mission impact.
Exploitation public PoC (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: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
44th
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 (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-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 2026-10-31). 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, Track* at medium and Attend at high mission impact.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, Track* at medium and Attend at high mission impact.

The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (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

October 1, 2026

Last Modified

October 1, 2026

Advisory Details (1)

Auto-updated Oct 1, 2026
Fix named in the CVE record. Sources: github.
GitHub advisoryMentions a patch (unverified)

Unrestricted ZIP Extraction in UpdateCE plugin leads to Remote Code Execution · Advisory · GetSimpleCMS-CE/GetSimpleCMS-CE · GitHub

https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-q5rx-gppg-768r

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 62× 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. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-11-01 16:04 UTCEG score recompute
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-31 14:13 UTCEG score recompute
  5. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  6. 2026-10-30 12:25 UTCEG score recompute
  7. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  8. 2026-10-29 10:36 UTCEG score recompute
  9. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  10. 2026-10-28 08:45 UTCEG score recompute
  11. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  12. 2026-10-27 06:27 UTCEG score recompute
  13. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  14. 2026-10-26 00:42 UTCEG score recompute
  15. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  16. 2026-10-25 14:18 UTCEG score recompute
  17. 2026-10-24 22:49 UTCEG score recompute
  18. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-23 21:01 UTCEG score recompute
  20. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-10-22 19:12 UTCEG score recompute
  22. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-10-21 17:19 UTCEG score recompute
  24. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  25. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
Show 44 more
  1. 2026-10-20 15:24 UTCEG score recompute
  2. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-19 13:34 UTCEG score recompute
  4. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-10-18 03:29 UTCEG score recompute
  6. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-10-17 09:54 UTCEG score recompute
  8. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-16 08:04 UTCEG score recompute
  10. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-15 06:15 UTCEG score recompute
  12. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-14 01:54 UTCEG score recompute
  14. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-12 22:11 UTCEG score recompute
  16. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-12 15:54 UTCEG score recompute
  18. 2026-10-11 19:38 UTCEG score recompute
  19. 2026-10-11 16:53 UTCEG score recompute
  20. 2026-10-11 14:04 UTCEG score recompute
  21. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-10 23:19 UTCEG score recompute
  23. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-10-09 21:34 UTCEG score recompute
  25. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  26. 2026-10-08 19:44 UTCEG score recompute
  27. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  28. 2026-10-08 03:26 UTCEG score recompute
  29. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  30. 2026-10-06 18:17 UTCEG score recompute
  31. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  32. 2026-10-05 20:15 UTCEG score recompute
  33. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  34. 2026-10-05 01:51 UTCEG score recompute
  35. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  36. 2026-10-03 16:41 UTCEG score recompute
  37. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  38. 2026-10-02 18:38 UTCEG score recompute
  39. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  40. 2026-10-02 00:09 UTCEG score recompute
  41. 2026-10-01 20:29 UTCEG score recompute
  42. 2026-10-01 20:01 UTCEG score recompute
  43. 2026-10-01 19:46 UTCEG score recomputeFirst assessed: 9.1 CRITICAL
  44. 2026-10-01 19:45 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-56660?
CVE-2026-56660 is a critical-severity vulnerability; its CVE record was published on October 1, 2026. GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the community edition of that CMS. Prior to version 1.5, the update handler in UpdateCE.php downloads a ZIP archive and extracts its contents into the web root without validating file types or extraction paths. Because PHP…
When was the CVE record for CVE-2026-56660 published?
The CVE record for CVE-2026-56660 was published on October 1, 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 1, 2026; the record at its source may have been updated since.
Is CVE-2026-56660 actively exploited?
CVE-2026-56660 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56660?
CVE-2026-56660 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56660?
The CVE record for CVE-2026-56660 names the fix: "This issue has been patched in version 1.5."

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