{"answers":{"affected":"","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101878 exists.","fix":"No fix has been published for CVE-2026-101878 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-101878 is a high-severity authentication bypass vulnerability in bitwarden server, published on 29 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-101878 and fix it if it is affected.\n\nWhat it is: CVE-2026-101878 is a high-severity authentication bypass vulnerability in bitwarden server, published on 29 Sep 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-2026-101878 exists.\n\nAffected product: bitwarden server. 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-2026-101878/ (Markdown: https://insights.sbomify.com/CVE-2026-101878/index.md)","id":"CVE-2026-101878","markdown":"https://insights.sbomify.com/CVE-2026-101878/index.md","name":"CVE-2026-101878","record":{"aliases":["GHSA-2fcc-4gv4-mvr7"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["account_takeover","privilege_escalation"],"network_reachable":"yes","non_default_config":true,"product_category":"Bitwarden Server","requires_auth":"low_privilege","summary":"Attackers can bypass authentication and impersonate users by exploiting SSO identifier truncation in SQL Server deployments of Bitwarden Server.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":7.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-303","name":"Incorrect Implementation of Authentication Algorithm"}],"description":"Bitwarden Server 2025.6.0 before 2026.5.0 declares the @ExternalId parameter of the User_ReadBySsoUserOrganizationIdExternalId stored procedure as NVARCHAR(50) while the column it queries stores NVARCHAR(300), silently truncating the SSO login identifier on SQL Server deployments and allowing a user whose identity-provider identifier begins with another organization member's full 50-character identifier to authenticate as that member and obtain a victim-scoped access token.","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":"Bitwarden Server 2025.6.0 \u003c 2025.6.0 Authentication Bypass via SSO Identifier Truncation","id":"CVE-2026-101878","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"OpenClaw Windows Node before 2026.7.1-3 Missing Authorization","id":"CVE-2026-101879"},"packages":[],"prev":{"headline":"Langflow Code Execution via eval() in Component Input Schema","id":"CVE-2026-101861"},"products":["bitwarden server"],"published":"2026-09-29","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-10-01","vendors":["bitwarden"]},"summary":"Attackers can bypass authentication and impersonate users by exploiting SSO identifier truncation in SQL Server deployments of Bitwarden Server.","url":"https://insights.sbomify.com/CVE-2026-101878/"}