Open Access Management (OpenAM) is an access management solution. Prior to 16.1.2, WebAuthnAuthentication.deserialize applies an ObjectInputFilter that allows every serialized object at depth greater than 1 and therefore constrains only an AuthenticatorImpl root object. A pre-authentication attacker can supply a userHandle whose serialized graph has a valid AuthenticatorImpl root and a nested gadget class, causing readObject or readResolve execution before the cast and assertion verification when a usable gadget is on the classpath. This bypasses the incomplete remediation for the earlier WebAuthn deserialization vulnerability. This issue is fixed in version 16.1.2.
CVE-2026-62263
CRITICALPre-NVD 9.29.2—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 55% 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, secondary
9.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.2Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.2
- EG Score
- 9.2(medium)
- EG Risk
- 42(Track)EG Risk 42/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity92% × 45%Exploitation1% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 45%
- KEV
- Not listed
Published
July 24, 2026
Last Modified
September 15, 2026
Advisory Details (3)
Auto-updated Sep 15, 2026Patch available. Sources: github_commit, github_release, github.
github Patch Available
OpenAM WebAuthn Java deserialization RCE via ObjectInputFilter depth · Advisory · OpenIdentityPlatform/OpenAM · GitHub
https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-gf8h-gq53-288jgithub_release Patch Available
16.1.2
Patch available: OpenIdentityPlatform/OpenAM 16.1.2
https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.2github_commit
commit 9dd0fbe07f70 (OpenIdentityPlatform/OpenAM)
Fix landed in OpenIdentityPlatform/OpenAM commit 9dd0fbe07f70 — awaiting tagged release
https://github.com/OpenIdentityPlatform/OpenAM/commit/9dd0fbe07f70f118cf45042d3a9ffb32f3c21e08Vendor Advisories for CVE-2026-62263(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)
Maven(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| org.openidentityplatform.openam:openam-auth-webauthn | 14.5.2 ... 16.1.1 (41 versions) | 16.1.2 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 14× in last 7d / 14× 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.
- 2026-09-20 20:16 UTCEPSS rescore
- 2026-09-20 01:39 UTCEG score recompute
- 2026-09-18 22:27 UTCEG score recompute
- 2026-09-18 19:28 UTCEPSS rescore
- 2026-09-18 02:57 UTCEG score recompute
- 2026-09-17 01:58 UTCEG score recompute
- 2026-09-16 14:08 UTCEPSS rescore
- 2026-09-16 06:38 UTCEG score recompute
- 2026-09-16 05:15 UTCEPSS rescore
- 2026-09-15 14:37 UTCEG score recompute
- 2026-09-15 13:58 UTCEG score recompute
- 2026-09-15 10:28 UTCEG score recompute
- 2026-09-15 09:58 UTCEG score recompute▲ 9.20
- 2026-09-15 09:57 UTCMITRE cvelistV5CVSS v3 → 9.2 · CVSS v4 → 9.2
- 2026-07-30 17:00 UTCEG score recompute
- 2026-07-27 19:08 UTCEG score recompute
- 2026-07-24 21:13 UTCEG score recompute
Related CVEs(same CWE)
Same CWE
10 shownCWE-502
Frequently asked(5)
What is CVE-2026-62263?
CVE-2026-62263 is a critical vulnerability published on July 24, 2026. Open Access Management (OpenAM) is an access management solution. Prior to 16.1.2, WebAuthnAuthentication.deserialize applies an ObjectInputFilter that allows every serialized object at depth greater than 1 and therefore constrains only an AuthenticatorImpl root object. A pre-authentication…
When was CVE-2026-62263 disclosed?
CVE-2026-62263 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-62263 actively exploited?
CVE-2026-62263 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.1% of all scored CVEs.
What is the CVSS score of CVE-2026-62263?
CVE-2026-62263 has a CVSS v3 base score of 9.2 (NVD).
How do I remediate CVE-2026-62263?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-62263, 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-2026-62263
Is Your Infrastructure Affected by CVE-2026-62263?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.