Vulnerability in Corewcf
CVE-2026-54780
CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, the CoreWCF WS-Security 1.0 receive pipeline validates ds:SignedInfo SignatureMethod against the configured SecurityAlgorithmSuite but does not validate each ds:Reference DigestMethod, allowing a sender to use a rejected digest algorithm such as SHA-1 while the message is still accepted. This issue is fixed in versions 1.8.1 and 1.9.1.
Vulnerability class: POODLE (CVE-2014-3566)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (13.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Corewcf — versions >= 1.9.0, < 1.9.1, < 1.8.1
Weakness classification (CWE)
References
- github.com/CoreWCF/CoreWCF/security/advisories/GHSA-4v55-cpmv-3vcm
- github.com/CoreWCF/CoreWCF/commit/58742312117cc671e6e9c694c2f5f9f669c17136
- github.com/CoreWCF/CoreWCF/commit/9104e581cff3d047ace5e179bfae86807a44be1f
- github.com/CoreWCF/CoreWCF/commit/fea67b2cd73a5a85115c325d504303ec7382e133
- github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1
- github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1
Frequently asked questions
- What is CVE-2026-54780?
- CVE-2026-54780 is a low-severity vulnerability in Corewcf, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 3.7/10. Published 2026-07-08.
- How severe is CVE-2026-54780?
- Low severity. CVSS v3 base score is 3.7 out of 10.