{"answers":{"affected":"10 open source packages ship an affected version, including github.com/coder/coder/v2 and github.com/coder/coder. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-55431 in the wild and no public exploit code.","fix":"Upgrade github.com/coder/coder/v2 to a fixed version for your release line: 2.29.17, 2.32.7, 2.33.8 or 2.34.2.","what":"CVE-2026-55431 is a high-severity vulnerability in coder, published on 8 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-55431 and fix it if it is affected.\n\nWhat it is: CVE-2026-55431 is a high-severity vulnerability in coder, published on 8 Jul 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-55431 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/coder/coder/v2 (Go): affected all versions; fixed in 2.29.17, 2.32.7, 2.33.8, 2.34.2\n- github.com/coder/coder/v2 (Go): affected all versions; fixed in 2.29.17\n- github.com/coder/coder/v2 (Go): affected all versions; fixed in 2.29.17\n- github.com/coder/coder/v2 (Go): affected from 2.30.0; fixed in 2.32.7\n- github.com/coder/coder/v2 (Go): affected from 2.30.0; fixed in 2.32.7\n- github.com/coder/coder/v2 (Go): affected from 2.33.0; fixed in 2.33.8\n- github.com/coder/coder/v2 (Go): affected from 2.33.0; fixed in 2.33.8\n- github.com/coder/coder/v2 (Go): affected from 2.34.0; fixed in 2.34.2\n- github.com/coder/coder/v2 (Go): affected from 2.34.0; fixed in 2.34.2\n- github.com/coder/coder (Go): affected all versions; no fix listed\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-2026-55431/ (Markdown: https://insights.sbomify.com/CVE-2026-55431/index.md)","id":"CVE-2026-55431","markdown":"https://insights.sbomify.com/CVE-2026-55431/index.md","name":"CVE-2026-55431","record":{"aliases":["GHSA-v54h-cp2w-9x4g","GO-2026-5924"],"analysis":{"component_type":"developer_tool","fix_type":"upgrade","impacts":["data_read","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Coder CLI","requires_auth":"low_privilege","summary":"Attackers can steal user session tokens by crafting malicious external app URLs in Coder workspaces, leading to potential account takeover.","user_interaction":"required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"coder","vendor":"coder"}],"cvss":{"score":7.7,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"},{"id":"CWE-522","name":"Insufficiently Protected Credentials"}],"description":"Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, `coder open app` opens external workspace-app URLs without validating the scheme or host. When an external app URL contains the `$SESSION_TOKEN` placeholder the CLI replaces it with the user's real session token before handing the URL to the OS open handler. Practical exploitation requires the victim to run `coder open app` against a workspace whose external app definition the attacker controls. Only a malicious template author can control external app URLs. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 applies a URL-scheme allowlist in the CLI and limits `$SESSION_TOKEN` substitution to trusted destinations like the web frontend. As a workaround, avoid running `coder open app` for untrusted workspaces.","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":"Coder's session token leaked to arbitrary hosts via `coder open app` for external workspace apps","id":"CVE-2026-55431","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"information_disclosure","year":"2026"},"n_packages":10,"n_references":6,"next":{"headline":"Coder's sub-agent app registration bypasses template port-sharing policy enforcement","id":"CVE-2026-55432"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/coder/coder","purl":"pkg:golang/github.com/coder/coder","source":"GO-2026-5924"},{"ecosystem":"Go","fixed":["2.29.17","2.32.7","2.33.8","2.34.2"],"introduced":["0","2.30.0","2.33.0","2.34.0"],"last_affected":[],"package":"github.com/coder/coder/v2","purl":"pkg:golang/github.com/coder/coder/v2","source":"GO-2026-5924"},{"ecosystem":"Go","fixed":["2.29.17"],"introduced":["0"],"last_affected":[],"package":"github.com/coder/coder/v2","purl":null,"source":"GHSA-v54h-cp2w-9x4g"},{"ecosystem":"Go","fixed":["2.29.17"],"introduced":["0"],"last_affected":[],"package":"github.com/coder/coder/v2","purl":"pkg:golang/github.com/coder/coder/v2","source":"GHSA-v54h-cp2w-9x4g"},{"ecosystem":"Go","fixed":["2.32.7"],"introduced":["2.30.0"],"last_affected":[],"package":"github.com/coder/coder/v2","purl":null,"source":"GHSA-v54h-cp2w-9x4g"},{"ecosystem":"Go","fixed":["2.32.7"],"introduced":["2.30.0"],"last_affected":[],"package":"github.com/coder/coder/v2","purl":"pkg:golang/github.com/coder/coder/v2","source":"GHSA-v54h-cp2w-9x4g"},{"ecosystem":"Go","fixed":["2.33.8"],"introduced":["2.33.0"],"last_affected":[],"package":"github.com/coder/coder/v2","purl":null,"source":"GHSA-v54h-cp2w-9x4g"},{"ecosystem":"Go","fixed":["2.33.8"],"introduced":["2.33.0"],"last_affected":[],"package":"github.com/coder/coder/v2","purl":"pkg:golang/github.com/coder/coder/v2","source":"GHSA-v54h-cp2w-9x4g"},{"ecosystem":"Go","fixed":["2.34.2"],"introduced":["2.34.0"],"last_affected":[],"package":"github.com/coder/coder/v2","purl":null,"source":"GHSA-v54h-cp2w-9x4g"},{"ecosystem":"Go","fixed":["2.34.2"],"introduced":["2.34.0"],"last_affected":[],"package":"github.com/coder/coder/v2","purl":"pkg:golang/github.com/coder/coder/v2","source":"GHSA-v54h-cp2w-9x4g"}],"prev":{"headline":"Coder's subdomain workspace app routing trusts unauthenticated X-Forwarded-Host header, enabling cross-app data access","id":"CVE-2026-55430"},"products":["coder"],"published":"2026-07-08","related":[{"cvss_score":9.1,"headline":"Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent token theft","id":"CVE-2026-46354","kev_date_added":null,"published":"2026-07-07"},{"cvss_score":8.7,"headline":"Coder's workspace app upsert allows cross-workspace agent rebinding via user-controlled app ID","id":"CVE-2026-55429","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":8.3,"headline":"Coder vulnerable to SSH config injection via unsanitized server-supplied values in `coder config-ssh`","id":"CVE-2026-55427","kev_date_added":null,"published":"2026-07-07"},{"cvss_score":8.2,"headline":"Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet coordinator","id":"CVE-2026-55428","kev_date_added":null,"published":"2026-07-07"},{"cvss_score":8.2,"headline":"Coder's OIDC authentication allows email with partially matching domain to register","id":"CVE-2024-27918","kev_date_added":null,"published":"2024-03-06"},{"cvss_score":8.1,"headline":"Coder vulnerable to workspace auto-creation via crafted URL parameters without user consent","id":"CVE-2026-44454","kev_date_added":null,"published":"2026-07-07"},{"cvss_score":8.1,"headline":"Coder's privilege escalation vulnerability could lead to a cross workspace compromise","id":"CVE-2025-58437","kev_date_added":null,"published":"2025-09-06"}],"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":"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":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-08","vendors":["coder"]},"summary":"Attackers can steal user session tokens by crafting malicious external app URLs in Coder workspaces, leading to potential account takeover.","url":"https://insights.sbomify.com/CVE-2026-55431/"}