{"answers":{"affected":"2 open source packages ship an affected version, including org.openidentityplatform.openam:openam. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33439 exists.","fix":"Upgrade org.openidentityplatform.openam:openam to 16.0.6 or later.","what":"CVE-2026-33439 is a critical unsafe deserialization vulnerability in OpenIdentityPlatform OpenAM, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-33439 and fix it if it is affected.\n\nWhat it is: CVE-2026-33439 is a critical unsafe deserialization vulnerability in OpenIdentityPlatform OpenAM, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33439 exists.\n\nAffected packages and fixed versions:\n- org.openidentityplatform.openam:openam (Maven): affected all versions; fixed in 16.0.6\n- org.openidentityplatform.openam:openam (Maven): affected all versions; fixed in 16.0.6\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-33439/ (Markdown: https://insights.sbomify.com/CVE-2026-33439/index.md)","id":"CVE-2026-33439","markdown":"https://insights.sbomify.com/CVE-2026-33439/index.md","name":"CVE-2026-33439","record":{"aliases":["GHSA-2cqq-rpvq-g5qj"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"OpenAM access management","requires_auth":"none","summary":"Unauthenticated attackers can execute arbitrary code on OpenAM servers by sending malicious serialized Java objects via the jato.clientSession parameter.","user_interaction":"not_required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"openam","vendor":"openidentityplatform"}],"cvss":{"score":9.3,"severity":"critical","source":"cna","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","version":"4.0"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"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 \u003cjato:form\u003e tags (e.g., the Password Reset pages). This vulnerability is fixed in 16.0.6.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":"2026-04-27","github_poc":8,"max_poc_stars":11,"metasploit":0,"nuclei":1,"refs":[{"date":"2026-04-30T06:25:46Z","kind":"github_poc","ref":"https://github.com/TheMalwareGuardian/CVE-2026-33439","stars":11,"title":"First publicly shared exploit implementation for CVE-2026-33439 (OpenAM pre-auth RCE via jato.clientSession deserialization)."},{"date":"2026-09-12T22:10:46Z","kind":"github_poc","ref":"https://github.com/infernosalex/CVE-2026-33439-Python-PoC","stars":5,"title":"Python PoC for CVE-2026-33439, an OpenAM pre-authentication RCE via jato.clientSession deserialization"},{"date":"2026-04-28T07:19:37Z","kind":"github_poc","ref":"https://github.com/Ibonok/CVE-2026-33439-PoC","stars":2,"title":"CVE-2026-33439"},{"date":"2026-04-27T16:22:31Z","kind":"github_poc","ref":"https://github.com/shreyas-malhotra/CVE-2026-33439-OpenAM","stars":0,"title":"Vulnerable endpoint description for CVE-2026-33439 in OpenAM"},{"date":"2026-09-19T17:33:44Z","kind":"github_poc","ref":"https://github.com/JonasChen0103/CVE-2026-33439-PoC","stars":0,"title":"CVE-2026-33439 OpenAM pre-auth RCE PoC"},{"date":"2026-09-20T22:40:15Z","kind":"github_poc","ref":"https://github.com/rh33t/CVE-2026-33439-Poc","stars":0,"title":"Proof of concept for CVE-2026-33439, an unauthenticated RCE in OpenAM via Java deserialization"},{"date":"2026-10-07T02:29:14Z","kind":"github_poc","ref":"https://github.com/amis13/openam-clean","stars":0,"title":"CVE-2026-33439"},{"date":"2026-10-29T16:33:24Z","kind":"github_poc","ref":"https://github.com/TeoVMP/CVE-2026-33439","stars":0,"title":"Pre-auth RCE exploit for OpenIdentityPlatform OpenAM \u003c=16.0.5 via Java deserialization of the jato.clientSession parameter (CVE-2026-33439, CVSS 9.8). Comparator-based gadget chain with in-band command output through Tomcat ApplicationFilterChain thread-locals."}],"tier":"weaponised"},"has_fix":true,"headline":"Pre-Authentication Remote Code Execution via `jato.clientSession` Deserialization in OpenAM","id":"CVE-2026-33439","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":2,"n_references":1,"next":{"headline":"Weblate: Authenticated SSRF via redirect bypass of ALLOWED_ASSET_DOMAINS in screenshot URL uploads","id":"CVE-2026-33440"},"packages":[{"ecosystem":"Maven","fixed":["16.0.6"],"introduced":["0"],"last_affected":[],"package":"org.openidentityplatform.openam:openam","purl":null,"source":"GHSA-2cqq-rpvq-g5qj"},{"ecosystem":"Maven","fixed":["16.0.6"],"introduced":["0"],"last_affected":[],"package":"org.openidentityplatform.openam:openam","purl":"pkg:maven/org.openidentityplatform.openam/openam","source":"GHSA-2cqq-rpvq-g5qj"}],"prev":{"headline":"Stirling-PDF vulnerable to DoS via add-watermark","id":"CVE-2026-33438"},"products":["OpenAM"],"published":"2026-04-07","related":[{"cvss_score":9.1,"headline":"User impersonation using SAMLv1.x SSO in Open Access Management","id":"CVE-2023-37471","kev_date_added":null,"published":"2023-07-20"},{"cvss_score":5.3,"headline":"NT auth module vulnerability in OpenAM","id":"CVE-2022-34298","kev_date_added":null,"published":"2022-06-22"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-04-08","vendors":["OpenIdentityPlatform"]},"summary":"Unauthenticated attackers can execute arbitrary code on OpenAM servers by sending malicious serialized Java objects via the jato.clientSession parameter.","url":"https://insights.sbomify.com/CVE-2026-33439/"}