🛡️ CVE-2026-54780 — corewcf.primitives

🟢 CVSS 3.7 — Low ✅ No Known Exploit CWE-327 NVD
3.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass

Impact

CoreWCF’s WS-Security 1.0 receive pipeline validates the SignatureMethod of an incoming ds:SignedInfo against the configured SecurityAlgorithmSuite, but does not validate the DigestMethod declared on each ds:Reference. As a result, a sender can populate ds:SignedInfo with SignatureMethod values the suite accepts (for example rsa-sha256 under Basic256Sha256) while declaring a per-reference DigestMethod the suite rejects (for example http://www.w3.org/2000/09/xmldsig#sha1). The signature is then verified where it permits SHA-1 digests, and the message is accepted.

Patches

Fixed in CoreWCF v1.8.1 and v1.9.1

Workarounds

None

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability none.

Weakness class

CVE-2026-54780 is classified as CWE-327: Use of a Broken or Risky Cryptographic Algorithm. An algorithm with known weaknesses is used, so the protection it appears to give does not hold.

Affected software

CVE-2026-54780 is recorded against 2 packages.

  • corewcf.primitives (from 1.9.0 up to 1.9.1)
  • unknown

Timeline and source

Published on 19 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
github.com (Package)

Details

Severity LOW
CVSS Score 3.7
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE CWE-327
Public Exploit ✅ No
Source NVD
Published 2026-06-19
Updated 2026-08-12
Modified 2026-06-19
Fix URL N/A

Affected Packages

Software From version Fixed in
corewcf.primitives 1.9.0 1.9.1
unknown — —

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