CVE-2026-12257

CRITICALPre-NVD 9.39.3
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (51st 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
Trending — 3 sources updated this week
9.3EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.3Exploit: None knownExposed services: Not assessed

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

The CVE record's description, written by its CNA (Spanish National Cybersecurity Institute, S.A. (INCIBE)), states the affected versions: "Versions of Mura CMS prior to 10.0.712 contain a critical remote code execution (RCE) vulnerability." No release containing a fix is confirmed on record.

Versions of Mura CMS prior to 10.0.712 contain a critical remote code execution (RCE) vulnerability. The flaw is located in the endpoint “/index.cfm/_api/json/v1/default”, where the “method” parameter in POST requests is not properly validated or sanitised before being processed by the ColdFusion engine. As a result, a remote attacker could exploit this vulnerability to inject and execute arbitrary CFML (ColdFusion Markup Language) expressions and instantiate malicious Java objects, thereby compromising the system’s security.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

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 (value × EchelonGraph’s weight)
Severity93% × 45%
The EG Score, 9.3 of 10.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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: 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
0.7%
EPSS %ILE
51st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track 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 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)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

July 13, 2026

Last Modified

July 13, 2026

Advisory Details (1)

Auto-updated Oct 8, 2026
No fix on record yet.
Web page

Remote code execution in Mura Software’s CMS | INCIBE-CERT | INCIBE

https://www.incibe.es/en/incibe-cert/notices/aviso/remote-code-execution-mura-softwares-cms

Vendor Advisories for CVE-2026-12257(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 41× 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.

Showing the most recent 100 of 377 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 277 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 02:54 UTCEG score recompute
  2. 2026-10-14 02:54 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  3. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  4. 2026-10-12 23:01 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  5. 2026-10-12 16:36 UTCEG score recompute
  6. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  7. 2026-10-12 09:49 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  8. 2026-10-11 20:12 UTCEG score recompute
  9. 2026-10-11 18:24 UTCEG score recompute
  10. 2026-10-11 14:58 UTCEG score recompute
  11. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  12. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  15. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  16. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  18. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  19. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  20. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  21. 2026-10-01 14:17 UTCEG score recompute
  22. 2026-10-01 14:17 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  23. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  25. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.7% · 51st percentile
Show 75 more
  1. 2026-09-28 13:18 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  2. 2026-09-28 09:31 UTCEG score recompute
  3. 2026-09-28 09:31 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  4. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  5. 2026-09-24 10:07 UTCEG score recompute
  6. 2026-09-24 10:07 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  7. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  8. 2026-09-23 09:12 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  9. 2026-09-23 05:26 UTCEG score recompute
  10. 2026-09-23 05:26 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  11. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  12. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-09-18 10:06 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  14. 2026-09-18 05:02 UTCEG score recompute
  15. 2026-09-18 05:02 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  16. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  17. 2026-09-14 11:07 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  18. 2026-09-14 06:58 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  19. 2026-09-14 03:12 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  20. 2026-09-13 23:32 UTCEG score recompute
  21. 2026-09-13 23:32 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  22. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  23. 2026-09-13 16:30 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  24. 2026-09-13 11:51 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  25. 2026-09-13 08:00 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  26. 2026-09-12 17:09 UTCEG score recompute
  27. 2026-09-12 17:09 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  28. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  29. 2026-09-12 13:28 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  30. 2026-09-12 01:52 UTCEG score recompute
  31. 2026-09-12 01:52 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  32. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  33. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  34. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  35. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  36. 2026-09-08 01:58 UTCEG score recompute
  37. 2026-09-08 01:58 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  38. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  39. 2026-09-06 13:50 UTCEG score recompute
  40. 2026-09-06 13:50 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  41. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  42. 2026-09-06 05:23 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  43. 2026-09-06 01:38 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  44. 2026-09-05 21:25 UTCEG score recompute
  45. 2026-09-05 21:25 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  46. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  47. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  48. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  49. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  50. 2026-08-30 23:48 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  51. 2026-08-30 20:08 UTCEG score recompute
  52. 2026-08-30 20:08 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  53. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  54. 2026-08-30 16:27 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  55. 2026-08-30 10:59 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  56. 2026-08-30 05:29 UTCEG score recompute
  57. 2026-08-30 05:29 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  58. 2026-08-30 01:21 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  59. 2026-08-28 21:40 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  60. 2026-08-28 02:33 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  61. 2026-08-27 21:36 UTCEG score recompute
  62. 2026-08-27 21:36 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  63. 2026-08-27 14:24 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  64. 2026-08-27 14:02 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  65. 2026-08-27 03:59 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  66. 2026-08-27 00:15 UTCEG score recompute
  67. 2026-08-27 00:15 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  68. 2026-08-26 12:51 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  69. 2026-08-26 07:58 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  70. 2026-08-26 02:24 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  71. 2026-08-25 19:17 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  72. 2026-08-25 14:41 UTCEG score recompute
  73. 2026-08-25 14:41 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw
  74. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  75. 2026-08-25 10:57 UTCGHSA enrichmentGHSA-h3q4-w5v4-67hw

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12257?
CVE-2026-12257 is a critical-severity vulnerability; its CVE record was published on July 13, 2026. Versions of Mura CMS prior to 10.0.712 contain a critical remote code execution (RCE) vulnerability. The flaw is located in the endpoint “/index.cfm/_api/json/v1/default”, where the “method” parameter in POST requests is not properly validated or sanitised before being processed by the ColdFusion…
When was CVE-2026-12257 made public?
CVE-2026-12257 was made public on July 13, 2026: that is the date its CVE record's CNA, Spanish National Cybersecurity Institute, S.A. (INCIBE), gives for when the vulnerability was made public. The CVE record itself was published on July 13, 2026. EchelonGraph's copy of the record carries a last-modified date of July 13, 2026; the record at its source may have been updated since.
Is CVE-2026-12257 actively exploited?
CVE-2026-12257 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-12257?
CVE-2026-12257 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-12257?
No fix for CVE-2026-12257 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 CVE record's description, written by its CNA (Spanish National Cybersecurity Institute, S.A. (INCIBE)), states the affected versions: "Versions of Mura CMS prior to 10.0.712 contain a critical remote code execution (RCE) vulnerability." No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-12257 are linked in the Vendor Advisories panel on this page.

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