diff --git a/management/server/http/handlers/proxy/auth.go b/management/server/http/handlers/proxy/auth.go
index 298fb503e..133236401 100644
--- a/management/server/http/handlers/proxy/auth.go
+++ b/management/server/http/handlers/proxy/auth.go
@@ -125,9 +125,9 @@ func (h *AuthCallbackHandler) handleCallback(w http.ResponseWriter, r *http.Requ
 			http.Error(w, "Failed to create session", http.StatusInternalServerError)
 			return
 		}
-		query.Set("session_code", code)
+		query.Set(auth.SessionCodeQueryParam, code)
 	} else {
-		query.Set("session_token", sessionToken)
+		query.Set(auth.SessionTokenQueryParam, sessionToken)
 	}
 	redirectURL.RawQuery = query.Encode()
 
diff --git a/management/server/http/handlers/proxy/auth_callback_integration_test.go b/management/server/http/handlers/proxy/auth_callback_integration_test.go
index 964841a63..862d5d5f2 100644
--- a/management/server/http/handlers/proxy/auth_callback_integration_test.go
+++ b/management/server/http/handlers/proxy/auth_callback_integration_test.go
@@ -532,8 +532,8 @@ func TestAuthCallback_UserAllowedToLogin(t *testing.T) {
 		wantParam   string
 		absentParam string
 	}{
-		{name: "legacy proxy", manager: testSessionCodeManager{}, wantParam: "session_token", absentParam: "session_code"},
-		{name: "compatible proxy", manager: testSessionCodeManager{supported: true}, wantParam: "session_code", absentParam: "session_token"},
+		{name: "legacy proxy", manager: testSessionCodeManager{}, wantParam: "session_token", absentParam: "nb_session_code"},
+		{name: "compatible proxy", manager: testSessionCodeManager{supported: true}, wantParam: "nb_session_code", absentParam: "session_token"},
 	}
 
 	for _, tt := range tests {
@@ -555,8 +555,8 @@ func TestAuthCallback_UserAllowedToLogin(t *testing.T) {
 			require.Empty(t, location.Query().Get(tt.absentParam))
 			require.Empty(t, location.Query().Get("error"))
 
-			if tt.wantParam == "session_code" {
-				code := location.Query().Get("session_code")
+			if tt.wantParam == "nb_session_code" {
+				code := location.Query().Get("nb_session_code")
 				response, err := setup.proxyService.ValidateSession(context.Background(), &proto.ValidateSessionRequest{
 					Domain:      location.Hostname(),
 					SessionCode: code,
diff --git a/proxy/auth/auth.go b/proxy/auth/auth.go
index 084046c49..605780959 100644
--- a/proxy/auth/auth.go
+++ b/proxy/auth/auth.go
@@ -30,6 +30,14 @@ const (
 	SessionJWTIssuer     = "netbird-management"
 )
 
+// Query parameters management uses to hand the OIDC session to the proxy. The
+// proxy strips them before forwarding, so they must not collide with names the
+// proxied service uses itself.
+const (
+	SessionCodeQueryParam  = "nb_session_code"
+	SessionTokenQueryParam = "session_token"
+)
+
 // HeaderUserID is the synthetic user id recorded for header-authenticated
 // requests. Header auth validates a per-service secret and resolves no user
 // record, so proxy access logs and management-minted session tokens both
diff --git a/proxy/internal/auth/middleware.go b/proxy/internal/auth/middleware.go
index 672286748..647741139 100644
--- a/proxy/internal/auth/middleware.go
+++ b/proxy/internal/auth/middleware.go
@@ -583,7 +583,7 @@ func (mw *Middleware) authenticateWithSchemes(w http.ResponseWriter, r *http.Req
 // handleAuthenticatedToken validates the token, handles denied access, and on
 // success sets a session cookie and redirects to the original URL.
 func (mw *Middleware) handleAuthenticatedToken(w http.ResponseWriter, r *http.Request, host, token string, config DomainConfig, scheme Scheme) {
-	isCode := scheme.Type() == auth.MethodOIDC && r.URL.Query().Get("session_code") != ""
+	isCode := scheme.Type() == auth.MethodOIDC && r.URL.Query().Get(auth.SessionCodeQueryParam) != ""
 	result, err := mw.validateSessionToken(r.Context(), host, token, isCode, config.SessionPublicKey, scheme.Type())
 	if err != nil {
 		if cd := proxy.CapturedDataFromContext(r.Context()); cd != nil {
@@ -661,7 +661,7 @@ func wasCredentialSubmitted(r *http.Request, method auth.Method) bool {
 	case auth.MethodPassword:
 		return credentialFormValue(r, passwordFormId) != ""
 	case auth.MethodOIDC:
-		return r.URL.Query().Get("session_token") != "" || r.URL.Query().Get("session_code") != ""
+		return r.URL.Query().Get(auth.SessionTokenQueryParam) != "" || r.URL.Query().Get(auth.SessionCodeQueryParam) != ""
 	}
 	return false
 }
@@ -806,11 +806,11 @@ func sessionGroupsAllowed(allowed map[string]struct{}, method auth.Method, group
 // or history.
 func stripSessionTokenParam(u *url.URL) string {
 	q := u.Query()
-	if !q.Has("session_token") && !q.Has("session_code") {
+	if !q.Has(auth.SessionTokenQueryParam) && !q.Has(auth.SessionCodeQueryParam) {
 		return u.RequestURI()
 	}
-	q.Del("session_token")
-	q.Del("session_code")
+	q.Del(auth.SessionTokenQueryParam)
+	q.Del(auth.SessionCodeQueryParam)
 	clean := *u
 	clean.RawQuery = q.Encode()
 	return clean.RequestURI()
diff --git a/proxy/internal/auth/middleware_test.go b/proxy/internal/auth/middleware_test.go
index 88c900f97..cce35ae35 100644
--- a/proxy/internal/auth/middleware_test.go
+++ b/proxy/internal/auth/middleware_test.go
@@ -786,9 +786,15 @@ func TestWasCredentialSubmitted(t *testing.T) {
 		{
 			name:     "OIDC code in query",
 			method:   auth.MethodOIDC,
-			query:    url.Values{"session_code": {"abc123"}},
+			query:    url.Values{"nb_session_code": {"abc123"}},
 			expected: true,
 		},
+		{
+			name:     "OIDC backend session_code in query",
+			method:   auth.MethodOIDC,
+			query:    url.Values{"session_code": {"abc123"}},
+			expected: false,
+		},
 		{
 			name:     "OIDC token not in query",
 			method:   auth.MethodOIDC,
@@ -1585,8 +1591,9 @@ func TestStripSessionTokenParam(t *testing.T) {
 		want string
 	}{
 		{"strips session_token", "https://ex.com/p?a=1&session_token=tok", "/p?a=1"},
-		{"strips session_code", "https://ex.com/p?a=1&session_code=code", "/p?a=1"},
-		{"strips both", "https://ex.com/p?session_token=tok&session_code=code&a=1", "/p?a=1"},
+		{"strips nb_session_code", "https://ex.com/p?a=1&nb_session_code=code", "/p?a=1"},
+		{"strips both", "https://ex.com/p?session_token=tok&nb_session_code=code&a=1", "/p?a=1"},
+		{"keeps backend session_code", "https://ex.com/p?a=1&session_code=backend", "/p?a=1&session_code=backend"},
 		{"no-op when absent", "https://ex.com/p?a=1", "/p?a=1"},
 	}
 	for _, tc := range cases {
diff --git a/proxy/internal/auth/oidc.go b/proxy/internal/auth/oidc.go
index 739777924..0215fddc3 100644
--- a/proxy/internal/auth/oidc.go
+++ b/proxy/internal/auth/oidc.go
@@ -43,12 +43,12 @@ func (o OIDC) Authenticate(r *http.Request) (string, string, error) {
 	// Check for the session credential returned by the OIDC callback. The management
 	// server passes it in the URL because it cannot set a cookie for the proxy's
 	// domain (cookies are domain-scoped per RFC 6265). The current flow uses a
-	// single-use session_code to keep the durable token out of the URL.
+	// single-use session code to keep the durable token out of the URL.
 	// session_token remains supported for backward compatibility.
-	if code := r.URL.Query().Get("session_code"); code != "" {
+	if code := r.URL.Query().Get(auth.SessionCodeQueryParam); code != "" {
 		return code, "", nil
 	}
-	if token := r.URL.Query().Get("session_token"); token != "" {
+	if token := r.URL.Query().Get(auth.SessionTokenQueryParam); token != "" {
 		return token, "", nil
 	}
 
diff --git a/proxy/internal/proxy/reverseproxy.go b/proxy/internal/proxy/reverseproxy.go
index 7583b2e01..a3987fe5a 100644
--- a/proxy/internal/proxy/reverseproxy.go
+++ b/proxy/internal/proxy/reverseproxy.go
@@ -725,9 +725,9 @@ func stripSessionCookie(r *httputil.ProxyRequest) {
 // from the outgoing URL to prevent credential leakage to backends.
 func stripSessionTokenQuery(r *httputil.ProxyRequest) {
 	q := r.Out.URL.Query()
-	if q.Has("session_token") || q.Has("session_code") {
-		q.Del("session_token")
-		q.Del("session_code")
+	if q.Has(auth.SessionTokenQueryParam) || q.Has(auth.SessionCodeQueryParam) {
+		q.Del(auth.SessionTokenQueryParam)
+		q.Del(auth.SessionCodeQueryParam)
 		r.Out.URL.RawQuery = q.Encode()
 	}
 }
diff --git a/proxy/internal/proxy/reverseproxy_test.go b/proxy/internal/proxy/reverseproxy_test.go
index c0724ce84..b26ca1f9f 100644
--- a/proxy/internal/proxy/reverseproxy_test.go
+++ b/proxy/internal/proxy/reverseproxy_test.go
@@ -236,6 +236,17 @@ func TestRewriteFunc_SessionTokenQueryStripping(t *testing.T) {
 			"other query parameters must be preserved")
 	})
 
+	t.Run("strips nb_session_code query parameter", func(t *testing.T) {
+		pr := newProxyRequest(t, "http://example.com/callback?nb_session_code=code123&other=keep", "1.2.3.4:5000")
+
+		rewrite(pr)
+
+		assert.Empty(t, pr.Out.URL.Query().Get("nb_session_code"),
+			"OIDC session code must be stripped from backend request")
+		assert.Equal(t, "keep", pr.Out.URL.Query().Get("other"),
+			"other query parameters must be preserved")
+	})
+
 	t.Run("preserves query when no session_token present", func(t *testing.T) {
 		pr := newProxyRequest(t, "http://example.com/api?foo=bar&baz=qux", "1.2.3.4:5000")
 
diff --git a/proxy/web/web.go b/proxy/web/web.go
index a45fc8730..de3e4771a 100644
--- a/proxy/web/web.go
+++ b/proxy/web/web.go
@@ -10,6 +10,8 @@ import (
 	"net/url"
 	"path/filepath"
 	"strings"
+
+	"github.com/netbirdio/netbird/proxy/auth"
 )
 
 // PathPrefix is the unique URL prefix for serving the proxy's own web assets.
@@ -180,8 +182,8 @@ func ServeAccessDeniedPage(w http.ResponseWriter, r *http.Request, code int, tit
 // stripAuthParams returns the request URI with auth-related query parameters removed.
 func stripAuthParams(u *url.URL) string {
 	q := u.Query()
-	q.Del("session_token")
-	q.Del("session_code")
+	q.Del(auth.SessionTokenQueryParam)
+	q.Del(auth.SessionCodeQueryParam)
 	q.Del("error")
 	q.Del("error_description")
 	clean := *u