{"answers":{"affected":"5 open source packages ship an affected version, including go.temporal.io/server.","exploited":"There is no known exploitation of CVE-2026-5199 in the wild and no public exploit code.","fix":"Upgrade go.temporal.io/server to a fixed version for your release line: 1.29.5 or 1.30.3.","what":"CVE-2026-5199 is a low-severity missing authorization vulnerability in temporal, published on 1 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-2026-5199 and fix it if it is affected.\n\nWhat it is: CVE-2026-5199 is a low-severity missing authorization vulnerability in temporal, published on 1 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-5199 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- go.temporal.io/server (Go): affected all versions; fixed in 1.29.5, 1.30.3\n- go.temporal.io/server (Go): affected all versions; fixed in 1.29.5\n- go.temporal.io/server (Go): affected all versions; fixed in 1.29.5\n- go.temporal.io/server (Go): affected from 1.30.0-143.0; fixed in 1.30.3\n- go.temporal.io/server (Go): affected from 1.30.0-143.0; fixed in 1.30.3\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-2026-5199/ (Markdown: https://insights.sbomify.com/CVE-2026-5199/index.md)","id":"CVE-2026-5199","markdown":"https://insights.sbomify.com/CVE-2026-5199/index.md","name":"CVE-2026-5199","record":{"aliases":["CLEANSTART-2026-BV78886","CLEANSTART-2026-DE80520","CLEANSTART-2026-LH40285","ECHO-7744-7b2d-d504","GHSA-xpg8-3hhp-p7w8","GO-2026-5766","MINI-2x2h-68jm-2hc8","MINI-3r9x-gpvj-cf5g","MINI-8v96-x5m6-v37q","MINI-jc5p-cjjx-hjh3","MINI-q3g3-vrpc-q28m","MINI-qf84-6c97-696v","MINI-v7rw-f98r-4mq7","MINI-x9jw-4vr3-5gg7"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Temporal Server","requires_auth":"low_privilege","summary":"Attackers can manipulate workflows in other namespaces if cross-namespace authorization is enabled, requiring specific IDs and names.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Temporal","cpe":[],"cvss":{"score":2.3,"severity":"low","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L/S:N/AU:Y/R:U/RE:M","version":"4.0"},"cwes":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key"}],"description":"A writer role user in an attacker-controlled namespace could signal, delete, and reset workflows or activities in a victim namespace on the same cluster. Exploitation requires the attacker to know or guess specific victim workflow ID(s) and, for signal operations, signal names. This was due to a bug introduced in Temporal Server v1.29.0 which inadvertently allowed an attacker to control the namespace name value instead of using the server's own trusted name value within the batch activity code. The batch activity validated the namespace ID but did not cross-check the namespace name against the worker's bound namespace, allowing the per-namespace worker's privileged credentials to operate on an arbitrary namespace. Exploitation requires a server configuration where internal components have cross-namespace authorization, such as deployment of the internal-frontend service or equivalent TLS-based authorization for internal identities.\n\nThis vulnerability also impacted Temporal Cloud when the attacker and victim namespaces were on the same cell, with the same preconditions as self-hosted clusters.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Cross Namespace Access via Batch Operation","id":"CVE-2026-5199","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"missing_authorization","year":"2026"},"n_packages":5,"n_references":2,"next":{"headline":"Missing authorization in AcyMailing – An Ultimate Newsletter Plugin and Marketing Automation Solution for WordPress","id":"CVE-2026-5200"},"packages":[{"ecosystem":"Go","fixed":["1.29.5","1.30.3"],"introduced":["0","1.30.0-143.0"],"last_affected":[],"package":"go.temporal.io/server","purl":"pkg:golang/go.temporal.io/server","source":"GO-2026-5766"},{"ecosystem":"Go","fixed":["1.29.5"],"introduced":["0"],"last_affected":[],"package":"go.temporal.io/server","purl":null,"source":"GHSA-xpg8-3hhp-p7w8"},{"ecosystem":"Go","fixed":["1.29.5"],"introduced":["0"],"last_affected":[],"package":"go.temporal.io/server","purl":"pkg:golang/go.temporal.io/server","source":"GHSA-xpg8-3hhp-p7w8"},{"ecosystem":"Go","fixed":["1.30.3"],"introduced":["1.30.0-143.0"],"last_affected":[],"package":"go.temporal.io/server","purl":null,"source":"GHSA-xpg8-3hhp-p7w8"},{"ecosystem":"Go","fixed":["1.30.3"],"introduced":["1.30.0-143.0"],"last_affected":[],"package":"go.temporal.io/server","purl":"pkg:golang/go.temporal.io/server","source":"GHSA-xpg8-3hhp-p7w8"}],"prev":{"headline":"code-projects Student Membership System Admin Login index.php sql injection","id":"CVE-2026-5198"},"products":["temporal"],"published":"2026-04-01","related":[],"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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-01","vendors":["Temporal Technologies, Inc."]},"summary":"Attackers can manipulate workflows in other namespaces if cross-namespace authorization is enabled, requiring specific IDs and names.","url":"https://insights.sbomify.com/CVE-2026-5199/"}