CVE-2026-12257

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
9.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.3Exploit: NoneExposed: 0

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

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
9.3(medium)
EPSS
33.2%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 13, 2026

Advisory Details (1)

Auto-updated Jul 13, 2026
No patch confirmed yet.
generic

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 27× in last 7d / 27× 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.

  1. 2026-07-16 00:18 UTCEG score recompute
  2. 2026-07-16 00:18 UTCGHSA enrichment
  3. 2026-07-15 20:38 UTCEG score recompute
  4. 2026-07-15 20:38 UTCGHSA enrichment
  5. 2026-07-15 16:57 UTCEPSS rescore
  6. 2026-07-15 16:57 UTCEG score recompute
  7. 2026-07-15 16:57 UTCGHSA enrichment
  8. 2026-07-15 13:16 UTCEG score recompute
  9. 2026-07-15 13:16 UTCGHSA enrichment
  10. 2026-07-15 09:35 UTCEG score recompute
  11. 2026-07-15 09:35 UTCGHSA enrichment
  12. 2026-07-15 05:53 UTCEG score recompute
  13. 2026-07-15 05:53 UTCGHSA enrichment
  14. 2026-07-15 02:10 UTCEG score recompute
  15. 2026-07-15 02:10 UTCGHSA enrichment
  16. 2026-07-15 02:00 UTCEPSS rescore
  17. 2026-07-14 22:26 UTCEG score recompute
  18. 2026-07-14 22:26 UTCGHSA enrichment
  19. 2026-07-14 18:45 UTCEG score recompute
  20. 2026-07-14 18:45 UTCGHSA enrichment
  21. 2026-07-14 15:04 UTCEG score recompute
  22. 2026-07-14 15:04 UTCGHSA enrichment
  23. 2026-07-14 11:23 UTCEG score recompute▲ 4.20
  24. 2026-07-14 11:23 UTCGHSA enrichment
  25. 2026-07-13 13:42 UTCMITRE cvelistV5CVSS v3 → 9.3 · CVSS v4 → 9.3 · severity → CRITICAL
Show 2 more
  1. 2026-07-13 11:57 UTCEG score recompute
  2. 2026-07-13 11:57 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12257?
CVE-2026-12257 is a critical vulnerability 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 disclosed?
CVE-2026-12257 was first published in the National Vulnerability Database on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12257 actively exploited?
CVE-2026-12257 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12257?
CVE-2026-12257 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-12257?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12257, 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

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