Duende.AccessTokenManagement.OpenIdConnect is a set of .NET libraries that manage OAuth and OpenId Connect access tokens. HTTP Clients created by AddUserAccessTokenHttpClient may use a different user's access token after a token refresh occurs. This occurs because a refreshed token will be captured in pooled HttpClient instances, which may be used by a different user. Instead of using AddUserAccessTokenHttpClient to create an HttpClient that automatically adds a managed token to outgoing requests, you can use the HttpConext.GetUserAccessTokenAsync extension method or the IUserTokenManagementService.GetAccessTokenAsync method. This issue is fixed in Duende.AccessTokenManagement.OpenIdConnect 3.0.1. All users are advised to upgrade. There are no known workarounds for this vulnerability.
CVE-2024-51987
MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 66% 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, nvd
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.4Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.4
- EG Score
- 5.4(medium)
- EPSS
- 12.6%
- KEV
- Not listed
Published
November 8, 2024
Last Modified
April 15, 2026
References (1)
- security-advisories@githubhttps://github.com/DuendeSoftware/Duende.AccessTokenManagement/security/advisories/GHSA-7mr7-4f54-vcx5
Affected Packages
(1 across 1 ecosystem)
NuGet(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| Duende.AccessTokenManagement.OpenIdConnect | 3.0.0 | 3.0.1 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Frequently asked(5)
What is CVE-2024-51987?
CVE-2024-51987 is a medium vulnerability published on November 8, 2024. Duende.AccessTokenManagement.OpenIdConnect is a set of .NET libraries that manage OAuth and OpenId Connect access tokens. HTTP Clients created by AddUserAccessTokenHttpClient may use a different user's access token after a token refresh occurs. This occurs because a refreshed token will be captured…
When was CVE-2024-51987 disclosed?
CVE-2024-51987 was first published in the National Vulnerability Database on November 8, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-51987 actively exploited?
CVE-2024-51987 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-51987?
CVE-2024-51987 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2024-51987?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-51987, 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
See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-51987
Is Your Infrastructure Affected by CVE-2024-51987?
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