CVE-2026-54783

HIGHPre-NVD 7.47.4
EchelonGraph scoreLOW confidence

This high-severity CVE scores 7.4 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: cna:github_m
7.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 7.4Exploit: NoneExposed: 0

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

CoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification allows replay of captured signed messages

Impact

The attacker, with one captured signed SOAP envelope from a victim and no other privileges, can invoke arbitrary operations on the service as the victim principal for the lifetime of the captured signing key. There is no rate limit on replays. The DetectReplays setting on transport-security bindings does not mitigate the issue because the attack does not reuse the original timestamp — the fresh timestamp in the wsse:Security header is what the replay-detection logic inspects.

Patches

Fixed in CoreWCF v1.8.1 and v1.9.1

Workarounds

Ensure communication is protected by SSL/TLS to prevent capturing of signed SOAP envelope.

CVSS v3
7.4
EG Score
7.4(low)
EPSS
—
KEV
Not listed

Published

June 19, 2026

Last Modified

June 19, 2026

Vendor Advisories for CVE-2026-54783(1)

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

Affected Packages

(1 across 1 ecosystem)
NuGet(1)
PackageVulnerable rangeFixed inDependents
CoreWCF.Primitives1.9.01.9.1—

Data Freshness Timeline

(refreshed 12× in last 7d / 32× 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. 2026-07-06 20:38 UTCEG score recompute
  2. 2026-07-06 06:21 UTCEG score recompute
  3. 2026-07-05 17:08 UTCEG score recompute
  4. 2026-07-05 04:07 UTCEG score recompute
  5. 2026-07-04 15:07 UTCEG score recompute
  6. 2026-07-04 02:07 UTCEG score recompute
  7. 2026-07-03 12:59 UTCEG score recompute
  8. 2026-07-02 23:22 UTCEG score recompute
  9. 2026-07-02 10:22 UTCEG score recompute
  10. 2026-07-01 21:21 UTCEG score recompute
  11. 2026-07-01 08:21 UTCEG score recompute
  12. 2026-06-30 19:20 UTCEG score recompute
  13. 2026-06-30 06:20 UTCEG score recompute
  14. 2026-06-29 17:19 UTCEG score recompute
  15. 2026-06-29 04:17 UTCEG score recompute
  16. 2026-06-28 15:17 UTCEG score recompute
  17. 2026-06-28 02:16 UTCEG score recompute
  18. 2026-06-27 13:16 UTCEG score recompute
  19. 2026-06-27 00:16 UTCEG score recompute
  20. 2026-06-26 11:13 UTCEG score recompute
  21. 2026-06-25 21:23 UTCEG score recompute
  22. 2026-06-25 08:22 UTCEG score recompute
  23. 2026-06-24 19:22 UTCEG score recompute
  24. 2026-06-24 05:40 UTCEG score recompute
  25. 2026-06-23 16:38 UTCEG score recompute
Show 7 more
  1. 2026-06-23 03:38 UTCEG score recompute
  2. 2026-06-22 14:37 UTCEG score recompute
  3. 2026-06-22 01:34 UTCEG score recompute
  4. 2026-06-21 12:31 UTCEG score recompute
  5. 2026-06-20 23:30 UTCEG score recompute
  6. 2026-06-20 10:29 UTCEG score recompute
  7. 2026-06-19 21:24 UTCEG score recompute

Frequently asked(4)

What is CVE-2026-54783?
CVE-2026-54783 is a high vulnerability published on June 19, 2026. CoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification allows replay of captured signed messages Impact The attacker, with one captured signed SOAP envelope from a victim and no other privileges, can invoke arbitrary operations on the service as the victim…
When was CVE-2026-54783 disclosed?
CVE-2026-54783 was first published in the National Vulnerability Database on June 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-54783?
CVE-2026-54783 has a CVSS v4.0 base score of 7.4 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-54783?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54783, 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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