{"id":"CVE-2026-104252","kind":"vulnerability","aliases":["CVE-2026-104252","GHSA-v75v-6fpf-gvw8","GO-2026-6798"],"related":[],"title":"Vitess vttablet /twopcz reflected XSS","description":"From: xylove21\nTo: security@vitess.io\nSubject: [Security Report] Vitess vttablet /twopcz reflected XSS\nDate: Tue, 24 Jun 2026 14:30:00 +0800\n\n## Summary\n\nThe `twopczHandler` in\n`go/vt/vttablet/tabletserver/twopcz.go` (line 185) reflects the `Action`\nand `dtid` form values directly into the HTML response body via\n`fmt.Fprintln(w, msg)` — **without HTML escaping**. The response is served\nas `text/html; charset=utf-8`, and Vitess's default `acl` policy is\n**allow-all**, so the endpoint is reachable by anyone who can hit the\nvttablet's HTTP port (default `15999`, multiplexed with gRPC and MySQL\nwire-protocol ports).\n\nA crafted `Action` or `dtid` value yields a **reflected XSS** that\nexecutes in the operator's browser with same-origin access to the\nvttablet's debug endpoints. This includes `/queryz` (live query plans),\n`/querylogz` (recent queries with bound values), `/txlogz` (transactions),\n`/debug/env` (environment variables — may include MySQL/topology\ncredentials), `/debug/vars` (expvar stats), and `/debug/pprof/*` if\nenabled.\n\nThe bug was introduced before v20.0.0 (long-standing) and was silently\nfixed in commit `3140c1846c` (merged 2026-06-09, PR #20255,\n\"tabletserver: escape reflected form values in twopcz handler\"). The\nfix replaces `fmt.Fprintln(w, msg)` with\n`fmt.Fprintln(w, html.EscapeString(msg))`. **No released version of\nVitess contains the fix** — the fix lives only on `main` (current tip\n`33a3c0fafe69`, 2026-06-23). There is **no CVE, GHSA, or OSV entry**\nfor this specific bug (verified 2026-06-24 against GitHub Advisory\nDatabase, OSV.dev, and NVD).\n\n## Impact\n\n| Field | Value |\n|-------|-------|\n| **Type** | Reflected Cross-Site Scripting (XSS) |\n| **CVSS 3.1** | `AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N` = **7.7 HIGH** |\n| **Attack Vector** | Network (vttablet HTTP port 15999, multiplexed with gRPC/MySQL) |\n| **Attack Complexity** | Low (craft URL, send to operator) |\n| **Privileges Required** | None (default `acl` policy is allow-all) |\n| **User Interaction** | Required (operator must visit crafted URL) |\n| **Scope** | Changed (XSS chain reaction to other vttablet debug endpoints) |\n| **Confidentiality** | High (query text, env vars, expvar stats) |\n| **Integrity** | None (XSS itself doesn't change state) |\n| **Availability** | None (XSS itself doesn't disrupt service) |\n\n### Affected versions (verified)\n\nAll released versions are vulnerable. The fix lives only on `main`:\n\n| Tag | Released | `twopcz.go` line 185 | Status |\n|---|---|---|---|\n| v20.0.0 | 2024-06-27 | `fmt.Fprintln(w, msg)` | **BUGGY** |\n| v20.0.1 - v20.0.6 | 2024 | `fmt.Fprintln(w, msg)` | **BUGGY** |\n| v22.0.4 | 2026-02-27 | `fmt.Fprintln(w, msg)` | **BUGGY** |\n| v23.0.3, v23.0.4 | 2026-02 / 2026-05 | `fmt.Fprintln(w, msg)` | **BUGGY** |\n| v24.0.0, v24.0.1 | 2026-04 / 2026-05 | `fmt.Fprintln(w, msg)` | **BUGGY** |\n| **main** (`33a3c0fafe69`) | 2026-06-23 | `fmt.Fprintln(w, html.EscapeString(msg))` | **FIXED** |\n\n### Sensitive data exposed via the same-origin XSS chain\n\nA successful XSS lands in the vttablet's origin. From there, the\nattacker can fetch (via `fetch()` from injected JavaScript) the\nfollowing same-origin endpoints, all of which are unauthenticated by\ndefault:\n\n- `/twopcz` — in-flight 2PC transactions (query text, parameters, dtid)\n- `/queryz` — live query plans\n- `/querylogz` — recent queries with bound values\n- `/txlogz` — transactions\n- `/debug/env` — environment variables (may include MySQL creds, topology\n  credentials, encryption keys)\n- `/debug/vars` — expvar stats\n- `/debug/pprof/*` — CPU/memory profiles (if enabled)\n\n## Reproduction (independent, runnable PoC)\n\nThe PoC is a self-contained Go HTTP server that replicates the buggy\n`twopczHandler` from Vitess v20.0.0 verbatim (using the same line-185\ncode). It runs on `127.0.0.1:15080` and returns the same response shape\nas the real Vitess endpoint.\n\n```bash\n# 1) Build the PoC (Go 1.23+)\ncd /path/to/finding/CVE-pending-twopcz-xss\ngo build -o /tmp/vitess-twopcz-poc ./poc.go\n\n# 2) Start the buggy server\nADDR=127.0.0.1:15080 /tmp/vitess-twopcz-poc &\n\n# 3) Reproduce — Test 1: bare GET (no params)\ncurl -sS -i \"http://127.0.0.1:15080/twopcz\"\n# → Content-Type: text/html; charset=utf-8, status 200\n\n# 4) Test 2: XSS via Action param (URL-encode the script tag)\ncurl -sS -i \"http://127.0.0.1:15080/twopcz?Action=%3Cscript%3Ealert(1)%3C%2Fscript%3E&dtid=zz\"\n# → Response body contains literal \"<script>alert(1)</script>(zz): completed.\"\n# → Browser executes the script as same-origin code\n\n# 5) Test 3: XSS via dtid param (attribute-context payload)\ncurl -sS -i \"http://127.0.0.1:15080/twopcz?Action=Demo&dtid=%3Cimg%20src%3Dx%20onerror%3Dalert(1)%3E\"\n# → Response body contains literal \"<img src=x onerror=alert(1)>\"\n# → Browser fires the onerror handler as same-origin code\n\n# 6) Run the 3x automated runner (writes evidence/run-{1,2,3}.log)\nbash ./poc/run.sh\n```\n\nPoC result excerpt (from `evidence/run-1.log`):\n\n```\n--- Test 2: XSS via Action=<script>alert(1)</script> ---\nHTTP/1.1 200 OK\nContent-Type: text/html; charset=utf-8\n...\n<h2>WARNING: Actions on this page can jeopardize data integrity.</h2>\n<script>alert(1)</script>(zz): completed.\n\nPASS: payload reflected UNESCAPED (XSS exploitable in browser)\n```\n\nThe PoC was run 3 times on the buggy server (all 3/3 PASS) and the same\ncode is byte-identical to the v20.0.0 commit `8aeb274f6c8e` line 185.\n\n## Root cause (technical detail)\n\n`go/vt/vttablet/tabletserver/twopcz.go` (v20.0.0 through v24.0.1):\n\n```go\n// Line 185\nfmt.Fprintln(w, msg)\n```\n\n`msg` is constructed earlier in the handler as:\n\n```go\nmsg := fmt.Sprintf(\"%s(%s): completed.\", action, dtid)\n```\n\nwith `action` and `dtid` coming from the form values\n`r.FormValue(\"Action\")` and `r.FormValue(\"dtid\")`. The form values are\nURL-decoded (so a `+` becomes a space, `%3C` becomes `<`) but never\nHTML-escaped. The handler explicitly sets `Content-Type: text/html;\ncharset=utf-8` (via the `<!DOCTYPE html>` it writes first), so the\nbrowser executes any injected `<script>` or attribute-context payload.\n\nThe fix in main (`fmt.Fprintln(w, html.EscapeString(msg))`) closes the\nhole by HTML-escaping both `action` and `dtid` before reflection.\n\n## Suggested fix (already in main)\n\n```go\n// Recommended minimal patch (already in main, needs backport to all release branches):\nimport \"html\"\n\nfunc twopczHandler(w http.ResponseWriter, r *http.Request) {\n    // ... existing logic ...\n    msg := fmt.Sprintf(\"%s(%s): completed.\", action, dtid)\n    fmt.Fprintln(w, html.EscapeString(msg))  // ← was: fmt.Fprintln(w, msg)\n}\n```\n\nBackport the fix to v20.0.x, v22.0.x, v23.0.x, and v24.0.x as patch\nreleases. The fix is one line and a one-line `import \"html\"` addition,\nso the backport risk is minimal.\n\n## Workaround / mitigation (no patch available)\n\nIf you cannot upgrade to a fixed release immediately:\n\n1. **Restrict the vttablet HTTP port** (default 15999) to localhost\n   only. vttablet can run with `--tablet-allow-stats=false` and\n   `--tablet-grpc-port` configured separately from the HTTP port, or\n   you can firewall the HTTP port at the network layer. The debug\n   endpoints are not needed by production traffic.\n\n2. **Set a non-default ACL policy**. Vitess supports an `acl` policy\n   that defaults to allow-all. Setting it to a JSON file that denies\n   unauthenticated access to debug endpoints (see\n   `go/acl/acl.go::savePolicy`) would block the XSS, but the default\n   policy is currently `\"\"` (allow-all) and many users don't override\n   it.\n\n3. **Use a reverse proxy** (nginx, envoy) in front of the vttablet\n   HTTP port with a strict allowlist of clients.\n\n## Cross-references\n\n  - The bug is **not** related to:\n    - CVE-2024-53257 (`/debug/querylogz` HTML injection, fixed in\n      v20.0.4 — different endpoint)\n    - CVE-2026-27969 (backup MANIFEST path traversal)\n    - CVE-2026-27965 / GHSA-8g8j-r87h-p36x (backup external decompressor\n      RCE)\n  - PR #20255 is the fix commit; PR #19486 (defense-in-depth) is a\n    separate hardening change\n\n## Contact\n\n  - GitHub: @xylove21","summary":"The vttablet /twopcz web page in Vitess reflects user-supplied input back into its HTML without proper escaping. An attacker who gets a user to open a crafted link can run scripts in that user's browser session on the Vitess admin page.","severity":"critical","cvss":9.8,"epss":0.01174,"exploited":false,"exploited_at":null,"products":[{"name":"vitess.io/vitess","fixed":["0.23.5","0.24.2"],"affected":">= 0.24.0, < 0.24.2","ecosystem":"go"},{"name":"linuxfoundation vitess","fixed":["23.0.5"],"affected":"< 23.0.5","ecosystem":"vendor"},{"name":"linuxfoundation vitess","fixed":["24.0.2"],"affected":">= 24.0.0, < 24.0.2","ecosystem":"vendor"},{"name":"vitess.io/vitess","fixed":["0.23.5"],"affected":"< 0.23.5","ecosystem":"go"}],"ecosystems":["go","vendor"],"tags":["cwe-116","cwe-79","cwe-80","go","kubernetes","mysql","package","vitess","vttablet"],"not_affected_if":["pre-0.24-default-config","vttablet-not-exposed"],"how_to_check":"- Check the Go module version of `vitess.io/vitess` in `go.mod` or with `go list -m vitess.io/vitess`\n- Confirm whether vttablet is reachable with its HTTP status page enabled, and whether `/twopcz` is served","fix":"- `vitess.io/vitess` `0.23.5` for the 0.23 line\n- `vitess.io/vitess` `0.24.2` for the 0.24 line","status":"open","published_at":"2026-10-13T20:17:12+00:00","first_seen_at":"2026-11-06T00:09:05+00:00","triaged_at":"2026-11-06T00:10:42+00:00","updated_at":"2026-11-06T00:19:08+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-06T00:10:42Z","model":"claude-haiku-5-5","output":{"fix":"- `vitess.io/vitess` `0.23.5` for the 0.23 line\n- `vitess.io/vitess` `0.24.2` for the 0.24 line","reach":"network","title":"Vitess: vttablet /twopcz page reflects input, enabling cross-site scripting","impact":"medium","summary":"The vttablet /twopcz web page in Vitess reflects user-supplied input back into its HTML without proper escaping. An attacker who gets a user to open a crafted link can run scripts in that user's browser session on the Vitess admin page.","audience":"businesses","category":"package","nicknames":[],"who_cares":["vitess","vttablet","go","mysql","kubernetes"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"script runs in an operator's browser session on the admin page","analyst_note":"","how_to_check":"- Check the Go module version of `vitess.io/vitess` in `go.mod` or with `go list -m vitess.io/vitess`\n- Confirm whether vttablet is reachable with its HTTP status page enabled, and whether `/twopcz` is served","plain_action":"","needs_analyst":false,"not_affected_if":["vttablet-not-exposed","pre-0.24-default-config"],"who_is_affected":"Teams running Vitess vttablet from the Go module at 0.24.0 up to but not including 0.24.2 are exposed. Versions on the 0.23 line are fixed at 0.23.5; the sources do not say whether earlier 0.23 releases are affected. Deployments that do not expose the vttablet web interface to users or operators' browsers are less exposed.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000725,"input_tokens":4206,"output_tokens":609,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'+0800':106C '-02':449C,458C '-04':468C '-05':460C,470C '-06':253C,294C,310C,434C,478C '-09':254C '-104252':8A,19A '-116':31B '-185':596C '-2026':7A,15A,18A '-23':295C,479C '-24':311C '-27':435C,450C '-6798':16A '-79':33B '-8':142C '-80':35B '/debug/env':221C,550C '/debug/pprof':232C,564C '/debug/vars':228C,561C '/path/to/finding/cve-pending-twopcz-xss':622C '/poc.go':627C '/querylogz':213C,542C '/queryz':209C,538C '/tmp/vitess-twopcz-poc':626C '/twopcz':3A,44B,95C,528C '/txlogz':219C,548C '/vitess':22A,29A '00':105C '1':615C '1.23':620C '127.0.0.1':601C '14':103C '15080':602C '15999':169C,348C '185':113C,430C '2':628C '2024':433C,442C '20255':256C 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'vttablet':2A,41B,43B,94C,164C,203C,345C,385C,501C 'vulner':419C 'w':129C,269C,273C,437C,444C,452C,462C,472C,481C 'web':45B 'wire':176C 'wire-protocol':175C 'without':58B,131C 'xss':5A,97C,188C,328C,380C,398C,406C,493C,497C 'xylove21':87C 'yield':185C","nicknames":[],"mitigations":[],"who_affected":"Teams running Vitess vttablet from the Go module at 0.24.0 up to but not including 0.24.2 are exposed. Versions on the 0.23 line are fixed at 0.23.5; the sources do not say whether earlier 0.23 releases are affected. 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For higher limits or API access: sales@infrastack.ai"}