CVE-2026-54779
CoreWCF: SAML token replay protection is inoperative
5.9
MEDIUM
CVSS 3.1
Description
### Impact When enabling DetectReplayedTokens, a token can be replayed and will be detected despite it being reused. ### Patches Fixed in CoreWCF v1.8.1 and v1.9.1 ### Workarounds Provide your own implementation of `ITokenReplayCache` with the correct behavior.
How to fix CVE-2026-54779
To remediate CVE-2026-54779, upgrade the affected package to a fixed version below.
- NuGet/CoreWCF.Primitives—upgrade to 1.8.1 or later
Is CVE-2026-54779 being exploited?
No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-54779.
Affected packages (1)
- from 0, < 1.8.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |