CVE-2026-33439
A public proof of concept exists; no exploitation attested.
- Published2026-04-07
- Fixed in16.0.6
- WeaknessCWE-502
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Open Access Management (OpenAM) is an access management solution. Prior to 16.0.6, OpenIdentityPlatform OpenAM is vulnerable to pre-authentication Remote Code Execution (RCE) via unsafe Java deserialization of the jato.clientSession HTTP parameter. This bypasses the WhitelistObjectInputStream mitigation that was applied to the jato.pageSession parameter after CVE-2021-35464. An unauthenticated attacker can achieve arbitrary command execution on the server by sending a crafted serialized Java object as the jato.clientSession GET/POST parameter to any JATO ViewBean endpoint whose JSP contains <jato:form> tags (e.g., the Password Reset pages). This vulnerability is fixed in 16.0.6.
Timeline
dates in UTC- 2026-04-0721:17CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-33439?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-33439?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 16.0 | < 16.0.6 | 16.0.6 | NVD · OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Openidentityplatform openam to 16.0.6
Advisories and patches
- github.comVendor Advisory
Detection
read 2026-10-23 19:25 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 7 repositories, unverifiedshreyas-malhotra/CVE-2026-33439-OpenAMIbonok/CVE-2026-33439-PoCTheMalwareGuardian/CVE-2026-33439infernosalex/CVE-2026-33439-Python-PoCJonasChen0103/CVE-2026-33439-PoC PoC-in-GitHub
Sources
- CISA-ADPSSVC decisionnone2026-04-08
- OpenCVESSVC decisionnone—
- CNACVSS 4.09.3read 2026-10-23
- NVDCVSS 3.19.8read 2026-10-23
- CNAweakness (CWE)CWE-502read 2026-10-23
- FIRST EPSSEPSS score8.4 %2026-10-23
- PoC-in-GitHubproof of concept7read 2026-10-23
- OSVaffected packages—
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 4.0 vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Published
- 2026-04-07
- Last Modified
- 2026-07-24
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2026-33439?
Is CVE-2026-33439 actively exploited?
What is the CVSS score for CVE-2026-33439?
Running openam? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
No credit card required · No monthly cap on website lookups · 250 API requests/month
Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
- Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.
Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.