{"answers":{"affected":"It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34840 exists.","fix":"No fix has been published for CVE-2026-34840 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-34840 is a high-severity authentication bypass vulnerability in oneuptime, published on 2 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-34840 and fix it if it is affected.\n\nWhat it is: CVE-2026-34840 is a high-severity authentication bypass vulnerability in oneuptime, published on 2 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-34840 exists.\n\nAffected product: oneuptime. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-34840/ (Markdown: https://insights.sbomify.com/CVE-2026-34840/index.md)","id":"CVE-2026-34840","markdown":"https://insights.sbomify.com/CVE-2026-34840/index.md","name":"CVE-2026-34840","record":{"aliases":["GHSA-5w5c-766x-265g"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["account_takeover","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"OneUptime monitoring platform","requires_auth":"low_privilege","summary":"Attackers can bypass SAML SSO authentication by injecting unsigned assertions, allowing unauthorized access to OneUptime accounts.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"oneuptime","vendor":"hackerbay"}],"cvss":{"score":8.1,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"description":"OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, OneUptime's SAML SSO implementation (App/FeatureSet/Identity/Utils/SSO.ts) has decoupled signature verification and identity extraction. isSignatureValid() verifies the first \u003cSignature\u003e element in the XML DOM using xml-crypto, while getEmail() always reads from assertion[0] via xml2js. An attacker can prepend an unsigned assertion containing an arbitrary identity before a legitimately signed assertion, resulting in authentication bypass. This issue has been patched in version 10.0.42.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":false,"headline":"OneUptime SSO: Multi-Assertion Identity Injection via Decoupled Signature Verification","id":"CVE-2026-34840","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Axios npm Supply Chain Incident Impacting @usebruno/cli","id":"CVE-2026-34841"},"packages":[],"prev":{"headline":"Glances Vulnerable to Cross-Origin Information Disclosure via Unauthenticated REST API (/api/4) due to Permissive CORS","id":"CVE-2026-34839"},"products":["oneuptime"],"published":"2026-04-02","related":[{"cvss_score":10,"headline":"Code injection in oneuptime","id":"CVE-2026-33396","kev_date_added":null,"published":"2026-03-26"},{"cvss_score":10,"headline":"OneUptime ClickHouse SQL Injection via Aggregate Query Parameters","id":"CVE-2026-32306","kev_date_added":null,"published":"2026-03-12"},{"cvss_score":10,"headline":"OneUptime has authorization bypass via client‑controlled is-multi-tenant-query header","id":"CVE-2026-30956","kev_date_added":null,"published":"2026-03-10"},{"cvss_score":10,"headline":"OneUptime Synthetic Monitor RCE via exposed Playwright browser object","id":"CVE-2026-30957","kev_date_added":null,"published":"2026-03-10"},{"cvss_score":10,"headline":"OneUptime Affected by Unsandboxed Code Execution in Probe Allows Any Project Member to Achieve RCE","id":"CVE-2026-30887","kev_date_added":null,"published":"2026-03-09"},{"cvss_score":10,"headline":"OneUptime Synthetic Monitor RCE via exposed Playwright browser object","id":"CVE-2026-30921","kev_date_added":null,"published":"2026-03-09"},{"cvss_score":10,"headline":"OneUptime: OS Command Injection in Probe NetworkPathMonitor via unsanitized destination in traceroute exec()","id":"CVE-2026-27728","kev_date_added":null,"published":"2026-02-25"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-04-02","vendors":["OneUptime"]},"summary":"Attackers can bypass SAML SSO authentication by injecting unsigned assertions, allowing unauthorized access to OneUptime accounts.","url":"https://insights.sbomify.com/CVE-2026-34840/"}