diff --git a/src/ssl_api_cert.c b/src/ssl_api_cert.c
index f54edcd8e4..73e598c75a 100644
--- a/src/ssl_api_cert.c
+++ b/src/ssl_api_cert.c
@@ -1536,6 +1536,14 @@ void wolfSSL_CTX_set_cert_store(WOLFSSL_CTX* ctx, WOLFSSL_X509_STORE* str)
         ctx->x509_store_pt    = str;
         /* Context has ownership and free it with context free. */
         ctx->cm->x509_store_p = ctx->x509_store_pt;
+
+#ifdef OPENSSL_EXTRA
+        /* Non-self-signed certs (intermediates) added via
+         * X509_STORE_add_cert only go into store->certs, not the
+         * CertManager. Push them into the CM now so that all
+         * verification paths can find them. */
+        X509StorePushCertsToCM(str);
+#endif
     }
 }
 
diff --git a/src/x509_str.c b/src/x509_str.c
index b224901624..986862c81c 100644
--- a/src/x509_str.c
+++ b/src/x509_str.c
@@ -1561,6 +1561,69 @@ static int X509StoreAddCa(WOLFSSL_X509_STORE* store,
     return result;
 }
 
+/* Push certificates from the store's X509 stacks (certs and trusted) into the
+ * CertManager, then free and NULL the stacks to signal that this store is now
+ * owned by an SSL_CTX.
+ *
+ * This is needed when an X509_STORE is attached to an SSL_CTX via
+ * SSL_CTX_set_cert_store: self-signed CAs are already in the CM (added by
+ * X509StoreAddCa during X509_STORE_add_cert), but non-self-signed intermediates
+ * are only in store->certs and must be explicitly added to the CM so that all
+ * verification paths (including CertManagerVerify) can find them. */
+WOLFSSL_LOCAL int X509StorePushCertsToCM(WOLFSSL_X509_STORE* store)
+{
+    int i;
+    int num;
+    int ret;
+    int anyFail = 0;
+    WOLFSSL_X509* x509;
+
+    WOLFSSL_ENTER("X509StorePushCertsToCM");
+
+    if (store == NULL || store->cm == NULL)
+        return WOLFSSL_SUCCESS;
+
+    /* Push non-self-signed intermediates from store->certs into the CM. */
+    if (store->certs != NULL) {
+        num = wolfSSL_sk_X509_num(store->certs);
+        for (i = 0; i < num; i++) {
+            x509 = wolfSSL_sk_X509_value(store->certs, i);
+            if (x509 != NULL) {
+                ret = X509StoreAddCa(store, x509, WOLFSSL_USER_CA);
+                if (ret != WOLFSSL_SUCCESS) {
+                    WOLFSSL_MSG("X509StorePushCertsToCM: failed to add cert");
+                    anyFail = 1;
+                }
+            }
+        }
+        /* Free and NULL to mark store as CTX-owned. Future add_cert calls
+         * will go directly to the CertManager. */
+        wolfSSL_sk_X509_pop_free(store->certs, NULL);
+        store->certs = NULL;
+    }
+
+    /* Push trusted certs too. Self-signed CAs are typically already in the CM
+     * (added during X509_STORE_add_cert), but AddCA handles duplicates. */
+    if (store->trusted != NULL) {
+        num = wolfSSL_sk_X509_num(store->trusted);
+        for (i = 0; i < num; i++) {
+            x509 = wolfSSL_sk_X509_value(store->trusted, i);
+            if (x509 != NULL) {
+                ret = X509StoreAddCa(store, x509, WOLFSSL_USER_CA);
+                if (ret != WOLFSSL_SUCCESS) {
+                    WOLFSSL_MSG("X509StorePushCertsToCM: failed to add "
+                                "trusted cert");
+                    anyFail = 1;
+                }
+            }
+        }
+        wolfSSL_sk_X509_pop_free(store->trusted, NULL);
+        store->trusted = NULL;
+    }
+
+    return anyFail ? WOLFSSL_FATAL_ERROR : WOLFSSL_SUCCESS;
+}
+
 int wolfSSL_X509_STORE_add_cert(WOLFSSL_X509_STORE* store, WOLFSSL_X509* x509)
 {
     int result = WC_NO_ERR_TRACE(WOLFSSL_FATAL_ERROR);
diff --git a/tests/api/test_ossl_x509_str.c b/tests/api/test_ossl_x509_str.c
index 111994a347..f9e2dd8318 100644
--- a/tests/api/test_ossl_x509_str.c
+++ b/tests/api/test_ossl_x509_str.c
@@ -1794,3 +1794,118 @@ int test_X509_STORE_No_SSL_CTX(void)
     return EXPECT_RESULT();
 }
 
+/* Test that SSL_CTX_set_cert_store propagates certificates (including
+ * non-self-signed intermediates) into the CertManager, and that certs
+ * added to the store after set_cert_store also reach the CertManager.
+ * Regression test for ZD 19760 / GitHub PR #8708.
+ */
+int test_wolfSSL_CTX_set_cert_store(void)
+{
+    EXPECT_DECLS;
+#if defined(OPENSSL_EXTRA) && !defined(NO_RSA) && !defined(NO_FILESYSTEM) && \
+    !defined(NO_WOLFSSL_CLIENT)
+    SSL_CTX* ctx = NULL;
+    X509_STORE* store = NULL;
+    X509* rootCa = NULL;
+    X509* intCa = NULL;
+    X509* int2Ca = NULL;
+    X509_STORE_CTX* storeCtx = NULL;
+    X509* svrCert = NULL;
+
+    const char caCert[]     = "./certs/ca-cert.pem";
+    const char intCaCert[]  = "./certs/intermediate/ca-int-cert.pem";
+    const char int2CaCert[] = "./certs/intermediate/ca-int2-cert.pem";
+    const char svrIntCert[] = "./certs/intermediate/server-int-cert.pem";
+
+    /* --- Part 1: Add certs to store BEFORE set_cert_store ---
+     * Non-self-signed intermediates should be pushed into the CertManager
+     * when set_cert_store is called. */
+    ExpectNotNull(store = X509_STORE_new());
+    ExpectNotNull(rootCa = wolfSSL_X509_load_certificate_file(caCert,
+                    SSL_FILETYPE_PEM));
+    ExpectNotNull(intCa = wolfSSL_X509_load_certificate_file(intCaCert,
+                    SSL_FILETYPE_PEM));
+    ExpectNotNull(int2Ca = wolfSSL_X509_load_certificate_file(int2CaCert,
+                    SSL_FILETYPE_PEM));
+
+    ExpectIntEQ(X509_STORE_add_cert(store, rootCa), SSL_SUCCESS);
+    ExpectIntEQ(X509_STORE_add_cert(store, intCa), SSL_SUCCESS);
+    ExpectIntEQ(X509_STORE_add_cert(store, int2Ca), SSL_SUCCESS);
+
+    ExpectNotNull(ctx = SSL_CTX_new(TLS_client_method()));
+
+    /* This should push intermediates from store->certs into the CM */
+    SSL_CTX_set_cert_store(ctx, store);
+
+    /* After set_cert_store, store->certs and store->trusted should be NULLed
+     * to signal CTX ownership */
+    if (EXPECT_SUCCESS()) {
+        ExpectNull(store->certs);
+        ExpectNull(store->trusted);
+    }
+
+    /* Verify using CertManagerVerify - this only checks the CM, not the
+     * store's certs stack, so it proves the intermediates were pushed */
+    ExpectIntEQ(wolfSSL_CertManagerVerify(wolfSSL_CTX_GetCertManager(ctx),
+                svrIntCert, SSL_FILETYPE_PEM), WOLFSSL_SUCCESS);
+
+    /* Also verify using X509_verify_cert for completeness */
+    ExpectNotNull(svrCert = wolfSSL_X509_load_certificate_file(svrIntCert,
+                    SSL_FILETYPE_PEM));
+    ExpectNotNull(storeCtx = X509_STORE_CTX_new());
+    if (EXPECT_SUCCESS()) {
+        ExpectIntEQ(X509_STORE_CTX_init(storeCtx,
+                    SSL_CTX_get_cert_store(ctx), svrCert, NULL), SSL_SUCCESS);
+        ExpectIntEQ(X509_verify_cert(storeCtx), SSL_SUCCESS);
+    }
+
+    X509_STORE_CTX_free(storeCtx);
+    storeCtx = NULL;
+    X509_free(svrCert);
+    svrCert = NULL;
+    SSL_CTX_free(ctx);
+    ctx = NULL;
+    /* store is freed by SSL_CTX_free */
+    store = NULL;
+
+    X509_free(rootCa);
+    rootCa = NULL;
+    X509_free(intCa);
+    intCa = NULL;
+    X509_free(int2Ca);
+    int2Ca = NULL;
+
+    /* --- Part 2: Add certs to store AFTER set_cert_store ---
+     * When store->certs is NULL (CTX-owned), X509_STORE_add_cert should
+     * route non-self-signed certs directly to the CertManager. */
+    ExpectNotNull(store = X509_STORE_new());
+    ExpectNotNull(ctx = SSL_CTX_new(TLS_client_method()));
+
+    /* Attach empty store first */
+    SSL_CTX_set_cert_store(ctx, store);
+
+    /* Now add certs after ownership transfer */
+    ExpectNotNull(rootCa = wolfSSL_X509_load_certificate_file(caCert,
+                    SSL_FILETYPE_PEM));
+    ExpectNotNull(intCa = wolfSSL_X509_load_certificate_file(intCaCert,
+                    SSL_FILETYPE_PEM));
+    ExpectNotNull(int2Ca = wolfSSL_X509_load_certificate_file(int2CaCert,
+                    SSL_FILETYPE_PEM));
+
+    ExpectIntEQ(X509_STORE_add_cert(store, rootCa), SSL_SUCCESS);
+    ExpectIntEQ(X509_STORE_add_cert(store, intCa), SSL_SUCCESS);
+    ExpectIntEQ(X509_STORE_add_cert(store, int2Ca), SSL_SUCCESS);
+
+    /* Verify that certs added after set_cert_store are in the CM */
+    ExpectIntEQ(wolfSSL_CertManagerVerify(wolfSSL_CTX_GetCertManager(ctx),
+                svrIntCert, SSL_FILETYPE_PEM), WOLFSSL_SUCCESS);
+
+    SSL_CTX_free(ctx);
+    /* store freed by SSL_CTX_free */
+    X509_free(rootCa);
+    X509_free(intCa);
+    X509_free(int2Ca);
+#endif
+    return EXPECT_RESULT();
+}
+
diff --git a/tests/api/test_ossl_x509_str.h b/tests/api/test_ossl_x509_str.h
index 9525a3a187..55812de730 100644
--- a/tests/api/test_ossl_x509_str.h
+++ b/tests/api/test_ossl_x509_str.h
@@ -41,6 +41,7 @@ int test_wolfSSL_X509_STORE_get1_certs(void);
 int test_wolfSSL_X509_STORE_set_get_crl(void);
 int test_wolfSSL_X509_CA_num(void);
 int test_X509_STORE_No_SSL_CTX(void);
+int test_wolfSSL_CTX_set_cert_store(void);
 
 #define TEST_OSSL_X509_STORE_DECLS                                             \
     TEST_DECL_GROUP("ossl_x509_store", test_wolfSSL_X509_STORE_CTX_set_time),  \
@@ -63,6 +64,7 @@ int test_X509_STORE_No_SSL_CTX(void);
     TEST_DECL_GROUP("ossl_x509_store", test_wolfSSL_X509_STORE_get1_certs),    \
     TEST_DECL_GROUP("ossl_x509_store", test_wolfSSL_X509_STORE_set_get_crl),   \
     TEST_DECL_GROUP("ossl_x509_store", test_wolfSSL_X509_CA_num),              \
-    TEST_DECL_GROUP("ossl_x509_store", test_X509_STORE_No_SSL_CTX)
+    TEST_DECL_GROUP("ossl_x509_store", test_X509_STORE_No_SSL_CTX),             \
+    TEST_DECL_GROUP("ossl_x509_store", test_wolfSSL_CTX_set_cert_store)
 
 #endif /* WOLFCRYPT_TEST_OSSL_X509_STR_H */
diff --git a/wolfssl/internal.h b/wolfssl/internal.h
index e12bdc1239..8ee4ee51da 100644
--- a/wolfssl/internal.h
+++ b/wolfssl/internal.h
@@ -2734,6 +2734,7 @@ WOLFSSL_LOCAL void CleanupStoreCtxCallback(WOLFSSL_X509_STORE_CTX* store,
 #endif /* !defined(NO_WOLFSSL_CLIENT) || !defined(WOLFSSL_NO_CLIENT_AUTH) */
 WOLFSSL_LOCAL int X509StoreLoadCertBuffer(WOLFSSL_X509_STORE *str,
                                         byte *buf, word32 bufLen, int type);
+WOLFSSL_LOCAL int X509StorePushCertsToCM(WOLFSSL_X509_STORE* store);
 #endif /* !defined NO_CERTS */
 
 /* wolfSSL Sock Addr */